National Statistical Institute

Labour Force Statistics Department

Tsveta Kostova-Sevastiyanova

Head of department

2, P. Vovov str.

1038 Sofia, Bulgaria

[email protected]

(+3592) 9857 619

The Labour force survey is a sample statistical survey carried out through households. The main purpose of the survey is to provide data on labour status of population aged 15 years and over and main characteristics of employed, unemployed and persons out of labour force in the Republic of Bulgaria.

In 2019 an ad hoc module on  work organisation and working time arrangements was incorporated in the regular Labour force survey. The 2019 ad hoc module provides detailed and comparable data on:

- flexibility of working time;

- autonomy of work;

- place of work and commuting time.

The classifications applied in the Labour force survey are harmonised with the international classifications in terms of economic activities, occupations, educational attainment. The main classification used are the following:               

• International Standard Classification of Education - ISCED 2011;
• Classification of Economic Activities - 2008, which is a Bulgarian version of NACE, Rev. 2 -  since 2008;
• National Classification of Occupations - 2011 (1st digit - occupational class), comparable to the International Standard Classification of Occupations – ISCO ’08 -  since 1 January 2011;
• International Classification of Status in Employment - ICSE-93;
• Classification of Territorial Units for Statistical Purposes in Bulgaria, harmonised with the European Classification of Territorial Units for Statistics - NUTS.

All persons aged 15 years and over living in the selected non-institutional households are covered by the Labour force survey. The target population for the ad hoc module "Work organisation and working time arrangements" consists of employed persons.

The main definitions applied in the survey are in accordance with the recommendation of International Labour Organization (ILO) and EU legislation.

Employed are persons aged 15 and over who during the reference period:

• performed some work for at least one hour for pay in cash or in kind or other income;
• did not work but had a job or an enterprise, a business from which they were temporarily absent due to illness, annual leave, full-paid maternity leave, parental leave, strike or another labour dispute, etc.

Professional status. According to professional status the employed persons are classified in the following categories:

• employers - persons who work in their own enterprise, business, farm, professional practice and  employ at least one other person;
• self-employed  - persons who work in their own enterprise, business, farm, professional practice and do not employ any other person;
• employees - persons who work for a public or private employer and who receive wages (salaries), fees, remuneration by civil contract etc.;
• unpaid family workers - persons who work without pay in an enterprise, farm, owned and operated by a relative of the same households.

In the tables consisting data from the ad hoc module on work organisation and working time arrangements, the employers, self-employed without employees and unpaid family workers are presented as one category – self-employed.

Persons living in private households.

Total population usually residing in Bulgaria, except persons living in collective households.

The ad hoc module "Work organisation and working time arrangements" refers to employed persons.

Whole territory of Republic of Bulgaria.

2019

Not applicable

Number of persons - in thousands

Generally, for every household in the LFS sample the reference period is one calendar week (from Monday to Sunday). As the sample for the ad hoc module is spread evenly trough all weeks of the year, the estimates are considered as annual averages.

Commission delegated regulation (EU) 2016/1851 of 14 June 2016 adopting the programme of ad hoc modules, covering the years 2019, 2020 and 2021, for the labour force sample survey provided for by Council Regulation (EC) No 577/98 (OL 2016 L 284, p.1);

Commission implementing regulation (EU) 2017/2384 of 19 December 2017 specifying the technical characteristics of the 2019 ad hoc module on work organisation and working time arrangements as regards the labour force sample survey pursuant to Council Regulation (EC) No 577/98 (OL 2017 L 340, p.35).

Not applicable

The confidentiality is guaranteed by:

• Law on Statistics;
• Regulation (EC) No 223/2009 of the European Parliament and of the Council of 11 March 2009 on European statistics (provision 24 and Article 20 (4)) (OJ L 87, p. 164), stipulates the necessity to establish common principles and guidelines ensuring the confidentiality of data used for the production of European statistics and the access to those confidential data with due account for technical developments and the requirements of users in a democratic society.

Individual anonymised data provided for the purposes of scientific research do not consist any administrative data as personal information and address and do not allow direct identification. Additional aggregation of data is performed for some of the variables.

In accordance with Article 25 of the Law on Statistics individual data are not published. Dissemination of individual data is possible only in accordance with Article 26 of the Law on Statistics.

The main results from the LFS ad hoc module on work organisation and working time arrangements were published on the NSI website on 9 July 2020.

https://www.nsi.bg/en/node/11368/basic-page

Data are disseminated on the NSI website, section "Labour Market" in accordance with the Law on Statistics and European Statistics Code of Practice respecting professional independence and in an objective, professional and transparent manner in which all users are treated equitably.

Accessibility of all users to statistical data and equality of their rights are stipulated in the Regulation for dissemination of statistical products and services by the National Statistical Institute.

One-off

Not available

Not available

The main results from the ad hoc module "Organisation of work and working time arrangements" are available for all users at the NSI website www.nsi.bg, section "Labour Market", Labour Force Survey

https://www.nsi.bg/en/node/18354

Individual anonymous micro-data could be provided for scientific research purposes by individual request according to the Regulation of submission of anonymous individual data for scientific and research purposes.

An information service could be  provided by request, according to the Rules for Dissemination of Statistical Information Products and Services.

• Labour force survey methodology:

      http://www.nsi.bg/sites/default/files/files/metadata/LFS_Methodology_EN.pdf

• Interviewer's instructions for the ad hoc module "Work organisation and working time arrangements";
• Eurostat's Explanatory notes for the ad hoc module "Work organisation and working time arrangements" variables.

Ensuring the quality of Labour force survey and its modules is according to the policy and Quality Management Programme of NSI.

The main users of LFS statistical data are:

· International organisations:

- European Commission - DG Employment and other Directorates;

- Eurostat - Labour market and lifelong learning unit and other units;

- European Central Bank;

- OECD;

- International Labour Organization;

- UNESCO;

- UNICEF.

· National users:

- Ministries and State agencies;

- Bulgarian National Bank;

- Trade Unions;

- Employers' organisations;

- Non-governmental organisations;

- Research institutions;

- Companies, agencies - for own marketing researches and consultancy activities.

Not available

All variables of ad hoc module "Work organisation and working time arrangements" according Commission implementing regulation (EU) 2017/2384 of 19 December 2017  were covered.

 

The sample used for the Labour force survey is a two-stage stratified cluster sample which includes quarterly about 19.6 thousand households (representing about 0.65% sampling rate).
The ad hoc module on work organisation and working time arrangements was carried out over a part (25%) of the LFS sample in each quarter and consisted of the households from the third wave.

Due to the sampling approach used in the Labour force survey, the estimation of the parameters obtained from the survey could vary from those in the population due to sampling errors, errors due to non-response, errors in registration or processing etc.

Coefficients of variation (relative standard errors), and confidence intervals (i.e. the range of values that 95% of times would capture the true value in the population) are calculated for assessment of stochastic reliability of the estimates for main indicators.

The results from the ad hoc module "Work organisation and working time arrangements" were presented on 9 July 2020.

 

Comparability across EU Member States is considered high due to use of harmonised concepts, variables, definitions and classifications.

 

Labour force survey ad hoc module on work organisation and working time arrangements was carried out in 2004 but due to differences in the methodology used data are not comparable with that from 2019 ad hoc module.

The number of employed persons according to the ad hoc module slightly differs from the corresponding average annual data from the Labour force survey due to use of sub-sample and presence of small number of respondents, not interviewed on the ad  hoc module.

The average duration of the interview on the ad hoc module "Work organisation and working time arrangements" was about 10 minutes per person.

Not applied

Households, persons

One-off

Data are collected through paper questionnaire and personal interview with employed persons from the selected households.

Plausibility checks are performed during the data entry. Additional consistency checks are carried out before publishing of data.

 

The filled in questionnaires are coded (for economic activity, occupation, place of work, field of education etc.) and entered into computer in NSI regional offices. Data files are sent to NSI head office, where additional control and weighting is done. Data are aggregated by different variables (characteristics), tabulated and disseminated.

National Statistical Institute

Labour Force Statistics Department

Tsveta Kostova - Sevastiyanova

Stanislava Statkova

Head of Department

State expert

2, P. Volov Str.; 1038 Sofia, Bulgaria

[email protected]

[email protected]

(+359 2) 9857 619

(+359 2) 9857 664

Annual data from the Labour Force Survey

The Labour force survey is a sample statistical survey carried out through households. The main purpose of the survey is to provide data on labour status of population aged 15 years and over and for the main characteristics of employed, unemployed and persons out of labour force in the Republic of Bulgaria.

The classifications applied in the Labour force survey are harmonised with the international classifications in terms of economic activities, occupations, levels of education. The main classifications used are the following:

• International Standard Classification of Education, 2011 version (ISCED 2011) - since the beginning of 2014;
• International Standard Classification of Education, 1997 version (ISCED 1997) - until the end of 2013;
• Classification of Economic Activities (CEA-2008, for international use NACE.BG 2008) - since 2008;
• National Classification of Occupations and Duties-2005 (NCOD-2005) (1st digit - occupational class), comparable to the International Standard Classification of Occupations - ISCO '88 - until the end of 2010;
• National Classification of Occupations and Duties-2011 (NCOD-2011) (1st digit - occupational class), comparable to the International Standard Classification of Occupations - ISCO'08 - since the beginning of 2011;
• International classification of professional status - ICSE-93;
• Classification of Territorial Units for Statistical Purposes in Bulgaria - NUTS.

All members of the selected non-institutional households are covered. The questions on labour market participation are asked to persons 15 to 89 years of age.

The Labour force survey provides estimates for the main characteristics of labour market as employment, unemployment, inactivity, occupations, economic activities, working time and other, as well as social-demographic characteristics as sex, age, place of residence (urban/rural), education etc.

The main definitions applied in the survey are in accordance with the recommendation of International Labour Organisation and EU legislation. 

Employed persons are persons 15 to 89 years of age who during the reference period:

• performed some work for at least one hour for pay in cash or in kind or other income;
• did not work but had a job or an enterprise, a business from which they were temporarily absent due to  following reasons:

- holidays, illness, maternity or paternity leave, working time arrangement;

- participation in job-related training;

- off-season, where persons continue regularly to perform tasks and duties for the job or business, excluding fulfilment of legal or administrative obligations;

- other absence (incl. unpaid parental leave for taking care of a child between 2 and 8 years of age), where the expected duration of this absence is 3 month or less.

Persons that produce agricultural goods are considered employed if the main part of these products is intended for sale or barter.

Unemployed persons are persons 15 to 74 years of age who were not employed during the reference week, according to the above definition, and

• were currently available for work, i.e. were available for paid employment or self-employment before the end of the 2 weeks following the reference week; and
• were actively seeking work in the four-week period ending with the reference week or found a job to start within a period of at most 3 months from the end of the reference week.

As active methods of job search are considered the following:

- contacting a public employment office in order to find work;

- contacting a private employment agency to find a job;

- contacting employers directly;

- asking friends, relatives, or acquaintances;

- placing or answering job advertisements;

- studying job advertisements;

- taking a recruitment test or examination or being interviewed;

- placing or updating CVs online;

- making preparations to set up a business.

Labour force (economically active population) comprises all employed and unemployed persons.

Activity rate (Participation rate) - the number of persons in the labour force (economically active population) as percentage of the total population.

Employment rate - the number of employed persons as percentage of the total population.

Unemployment rate - the number of unemployed persons as percentage of the labour force (economically active population).

Duration of unemployment is the duration of the search for employment or the length of the period since leaving last job, whichever period is shorter.

Long-term unemployed persons are persons who have been unemployed for one or more years.

Long-term unemployment rate - long-term unemployed persons as percentage of the economically active population (labour force).

Persons not in the labour force (inactive population) are persons who were neither employed, nor unemployed during the reference period (incl. all persons aged below 15 or above 89 completed years).

Discouraged persons are persons not in the labour force 15 to 74 years of age who want to work but are not actively looking for job, because they do not believe they will find suitable job.

Working time. Distinction between full-time and part-time work is made according to the subjective declaration of the respondents.

The number of actual working hours per week refers to the main job, incl. paid or unpaid overtime.

Professional status. According to the professional status the employed persons are classified in the following categories:

• employers - persons who work in their own enterprise, business, farm, professional practice and employ at least one other person;
• self-employed - persons who work in their own enterprise, business, farm, professional practice and do not employ any other person;
• employees - persons who work for a public or private employer and who receive wages (salaries), fees, remuneration by civil contract etc.;
• unpaid family workers - persons who work without pay in an enterprise, farm, owned and operated by a family member.

Economic activity. Economic activity is defined by the type of production or services provided by the local units of an enterprise, where a person works. Employed persons are classified by economic activity according to the NACE.BG 2008. Aggregated economic activity groupings according to nomenclature A21 are used.

Economic sectors. The employed are classified by economic sectors through aggregation of the economic activity grouping as follows:

• The Agriculture and forestry sector includes Agriculture, hunting, forestry and Fishing;
• The Industry sector includes Mining and quarrying, Manufacturing, Electricity, gas, steam and air conditioning supply, Water supply, sewerage, waste management and remediation activities, Construction;
• The Service sector includes all other economic activities.

Occupations. Occupation is defined by the type of work that the person carries out on the main job during the reference week.

Underemployed part-time workers and potential labour force

• Underemployed part-time workers - Persons working part-time who wish to work additional hours and are available to do so.
• Persons seeking work but not immediately available - Persons not in the labour force who meet one of the following criteria:

- actively seeking work during the last 4 weeks ( incl. the reference week) but not available to start working within 2 weeks after the reference period; or

- had found a job but are not available to start working within 2 weeks after the reference period;

• Persons available to work but not seeking - Persons not in the labour force who want to work, are available to start working within 2 weeks after the reference period and:

- do not seek work; or

- are passively seeking work during the last 4 weeks; or

- had found a job to start in more than 3 months.

Specific indicators

• Employment rate of women with at least one child under 7 - a ratio between employed women (15 to 64 years of age) with at least one child under 7 years of age, living in the same household, and the total number of women (15 to 64 years of age) with at least one child under 7 years of age, living in the same household.
• Variation of the employment rate (15 to 64 years of age) by statistical regions - calculated as the coefficient of variation of the employment rate (15 to 64 years of age) by statistical regions (NUTS 2). The indicator measures regional differences in employment within the country. Its value is 0 when the employment rate is the same for all regions and increases with increasing differences in the employment rate between regions.
• Variation of the unemployment rate by statistical regions - calculated as the coefficient of variation of the unemployment rate by statistical regions (NUTS 2). The indicator measures regional differences in unemployment within the country. Its value is 0 when the unemployment rate is the same for all regions and increases with increasing differences in the unemployment rate between regions.
• Jobless households (Share of persons who are living in households where no-one works) – represent the ratio between persons (aged 0-17 or 18-59) living in households without employed persons  and the total population of the same age group. Students 18 to 24 years of age living in households composed only of students in the same age group are excluded.
• Early leavers from education and training - a ratio between persons 18 to 24 years of age having attained lower secondary education as a highest and not participating in education and training in the four weeks incl. reference week, by the population of the same age group.
• Youth education attainment level, age group 20-24 - share of population 20 to 24 years of age having completed at least upper secondary education (ISCED 2011 level 3) of the population of the same age group.
• Tertiary educational attainment, age group 25-34 - share of population 25 to 34 years of age having completed tertiary education (ISCED 2011 levels 6-8) in the total population of the same age group.
• Lifelong learning - share of population 25 to 64 years of age participating in education or training in the four weeks, incl. reference week, by the total population of the same age group.
• Young people neither in employment nor in education and training - share of population aged 15-24/15-29 not employed during the reference period and not participating in education or training in the four weeks, incl. reference week, by the total population of the same age group.

Persons

Total population usually residing in Bulgaria, except persons living in collective households.

The whole territory of Republic of Bulgaria.

2003 - 2024

Not applicable

Source of data is Labour force survey, carried out over a sample of about 19.6 thousand households.

Quarterly. Annual data are calculated as an average of the four quarters of the year.

Data are collected through questionnaire and personal interview with persons from the selected households. The questions on labour market participation are asked to persons 15 to 89 years of age.

Plausibility checks are performed during the data collection. Additional consistency checks are carried out before publishing of data.

Data files are sent to NSI, where additional control and weighting is doing. Data are aggregated by different variables (characteristics), tabulated and disseminated. 

Not applied

Assurance of quality of Labour force survey in accordance with Quality management policy and Quality management programme of NSI.

NSI follows the recommendation of Eurostat Task Force on the Quality of the EU-LFS by fulfillment of the national Action Plan.

LFS Quality Report consisting information of different quality aspects is prepared each year.

The main users of LFS statistical data are:

• International organisations:

- European Commission - DG Employment and other Directorates

- Eurostat - Labour Market unit and other units

- European Central Bank

- OECD

- International Labour Organisation

- UNESCO

- UNICEF

• National users:

- Ministries and State agencies

- Bulgarian National Bank

- Trade Unions

- Employers' organisations

- Non-governmental organisations

- Research institutions

- Companies, agencies - for own marketing researches or consultancy activities.

Not available

The national Labour force survey implements the full set of compulsory variables, according to EU Regulations.

The national Labour force survey implements the full set of compulsory variables, according to EU Regulations.

The sample used for the Labour force survey is a two-stage stratified cluster sample which includes about 19.6 thousand households each quarter (representing about 0.65% sampling rate). Due to the sampling approach used in the Labour force survey, the estimation of the parameters obtained from the Labour force survey could vary from those in the population due to sampling errors, errors due to non-response, errors in registration or processing etc.

Coefficients of variation (relative standard errors), standard errors and confidence intervals (i.e. the range of values that 95% of times would capture the true value in the population) are calculated for assessment of stochastic reliability of the estimates for main indicators.

11.3%

Not applicable

Non-response rate (2023) - %¹

¹ Non-occupied dwellings are not included in the calculation of non-response rate.

The relatively high item non-response rate (>10%) is observed only for few variables as: hours actually worked on second job, duration of temporary contract etc.

Not applicable

Not applied

Revisions of previously released data are usually not performed. By exception revisions may happen after new estimates of population from a Population Census became available.

Revised data with population estimates based on the 2011 Census and the 2021 Census have been published at the NSI website.

The main LFS results are released about 2.5 months after the end of the reference year.

The main LFS results are released about 2.5 months after the end of the reference year.

The LFS results are released strictly to the Release Calendar.

The LFS results are released strictly to the Release Calendar.

Comparability across EU Member States is considered high due to use of harmonised concepts, variables, definitions and classifications.

Since the beginning of 2003 a quarterly continuous Labour force survey which provides quarterly and annual estimates is implemented. From the same year the harmonised definition of unemployment in accordance with Commission Regulation No 1897/2000 has been applied.

Since the first quarter of 2012 a new weighting procedure has been used in the labour force survey which should be taken into account in use of LFS data. The main differences from the procedure used in previous years are the following:

• the number of age groups at national level for which the consistence between LFS estimates and current population estimates is achieved increased (from 4 to 14);
• population data used in LFS weighting procedure exclude population living in institutional households (which are not covered by the survey).

The discrepancy between current population estimates (used for initial LFS quarterly and annual estimates for 2010 and 2011) and the data from the Population Census as of 1 February 2011 has also impact over the comparability of LFS data. Due to availability of new population estimates based on 2011 Population Census and changes in LFS weighting procedure revised LFS estimates for 2010 and 2011 are produced and published at the NSI website. In consequence the revised data for 2010 are not fully comparable with those for previous years.

Similarly, the data for 2021 and 2022 have been revised due to the availability of population estimates based on the 2021 Census.

Certain changes in the methodology of the Labour Force Survey took place in the first quarter of 2021 in line with the implementation of Regulation (EU) 2019/1700 of European Parliament and of the Council establishing a common framework for European statistics relating to persons and households, based on data at individual level collected from samples, and consequent implementing regulations of the European Commission in the field of Labour Force statistics. These changes concern mainly employment and unemployment definitions, in particular:

• Persons on leave for looking after a child of one to two years of age who are receiving fixed compensation during that leave, are considered employed (they used to be considered economically inactive persons up to the end of 2020);
• Persons on an unpaid parental leave for looking after a child of two to eight years of age are considered employed only if the one time duration of using that leave is at most three months. All persons on this kind of leave used to be considered employed up to 2020.
• Persons who are absent from work due to reasons other than holidays, illness, accident or paid maternity and parental leave are considered employed only if the expected duration of this absence is 3 months or less (even they are being partially compensated);
• Persons who produce agricultural goods for self-consumption are excluded from the employed person’s category even if they satisfy their household’s main consumption needs by that production. Employed are considered only persons growing agricultural produce, which main part is intended  for sale or barter.

The changes made in the methodology of the Labour Force Survey cause breaks in the time series, and in consequence, the data from 2021 onwards are not fully comparable with those for previous years.

Coherence with population data

The LFS uses the latest available population estimates (by age, place of residence, age group and districts) to gross up sample results. Since 2012 population data used for LFS estimates excluded persons living in collective households (which are out of scope of the survey).

Coherence with employment estimates in National Accounts

National Accounts use different data sources which are combined to obtain the best comprehensive and consistent estimate. In results National Accounts data could differ from the results of each source. For Bulgaria the main difference between LFS and NA (Table 3 in the Annex) refers to Agricultural employment. In the estimation of self-employment in agriculture NA use data based on Agricultural Census and sample surveys, carried out by Ministry of Agriculture and Food.

NA employment data are based on domestic concept (employment in resident production units irrespective of the place of residence of the employee) while LFS gives information on the national concept (i.e. resident employed).

LFS does not cover persons living in collective households, who are included in NA employment estimates.

Coherence with Annual and Quarterly Surveys on employees, hours worked, wages and salaries and other expenditures paid by the employer

The main methodological difference between the two surveys (Table 1 in the Annex) is the coverage of employed persons. The surveys on employee, hours worked, wages and salaries and other expenditures provides data on persons who work under employment contract according to the Labour Code or the State Officials Act, while the Labour force survey covers also persons employed by other type of contract or without formal contract and self employed persons (employers, own account workers and unpaid family workers). The published data on employees by labour contract do not include defence and public security activities.

The existed differences in terms of survey units, reference periods, modes of classifying by economic activities (register/description given by the respondents), principles of territorial treatment (by place of work/by place of living) also influenced on the comparability of results from the surveys.

Coherence with registered unemployment data

The main methodological differences between the LFS data on unemployment and data on registered unemployment provided by National Employment Agency (Table 2 in the Annex) are the following:

• According to the International Labour Organisation (ILO) definition applied in Labour force survey unemployed are considered not only and not all persons, registered in employment offices, but also those who are looking for job using other active methods: by private employment agencies, direct application to employers, assistance from friends or relatives, placing, answering or studying job advertisements in newspapers, magazines. The registration itself is not regarded as active method unlike the contact with an employment agency with a purpose to find a job.
• In contrast to registered unemployed, students and pensioners who are actively looking for work and are available for work are considered as unemployed in LFS.
• The data on economically active population used as denominator for the calculation of unemployment rate is different - in LFS economically active population consists of employed and unemployed persons, as estimated through the same survey, while for calculation of registered unemployment rate, Population Census data for economically active population is being used.

The yearly LFS data are calculated as average of the four quarters of the respective year.

Coherence with employment estimates in National Accounts

National Accounts use different data sources which are combined to obtain the best comprehensive and consistent estimate. In results National Accounts data could differ from the results of each source. For Bulgaria the main difference between LFS and NA (Table 3 in the Annex) refers to Agricultural employment. In the estimation of self-employment in agriculture NA use data based on Agricultural Census and sample surveys, carried out by Ministry of Agriculture and Food.

NA employment data are based on domestic concept (employment in resident production units irrespective of the place of residence of the employee) while LFS gives information on the national concept (i.e. resident employed).

LFS does not cover persons living in collective households, who are included in NA employment estimates.

Some of the totals (rows and columns) in tables are not equal to the sum of the components because of the rounding of figures.

Press release for the main Labour force survey annual results is posted on the NSI website (http://www.nsi.bg/en) according to the Release Calendar.

General Publications of the NSI:

• Statistical Reference Book;
• Statistical Yearbook;
• "Bulgaria" (brochure).

Detailed annual results are available to all users on the NSI website under the heading Labour Market, Labour Force Survey, Annual data: http://www.nsi.bg/en/node/6486 and through the information system INFOSTAT: https://infostat.nsi.bg/infostat/pages/module.jsf?x_2=96

Not available

Individual anonymous micro-data could be provided for the scientific and research purposes by individual request according to the Regulation of submission of anonymous individual data for scientific and research purposes.

An information service could be provided by request, according to the NSI Rules for Dissemination of Statistical Information Products and Services.

Not available

• Methodology of the Labour force survey: http://www.nsi.bg/sites/default/files/files/metadata/LFS_Methodology_EN.pdf
• Leaflet "Labour Force Survey" - in Bulgarian
• Interviewers' instructions.

Annual Quality reports

LFS Quality report according to ESS Standard for Quality Reports Structure (ESQRS) is available on the NSI website: https://nsi.bg/en/node/15276

The average duration of LFS interview is about 15 minutes per person. The individual duration of an interview depends on the labour status of person and survey wave.

• Law on Statistics;
• Regulation (EC) No 223/2009 of the European Parliament and of the Council of 11 March 2009 on European statistics (provision 24 and Article 20 (4)) (?J L 87, p. 164), stipulates the necessity to establish common principles and guidelines ensuring the confidentiality of data used for the production of European statistics and the access to those confidential data with due account for technical developments and the requirements of users in a democratic society.

In accordance with Article 25 of the Law on Statistics Individual data are not published. Dissemination of individual data is possible only in accordance with Article 26 of the Law on Statistics.

Individual anonymous data provided for the purposes of scientific research do not consist any administrative data as personal information and address and do not allow direct identification. Additional aggregation of data is performed for some of the variables.