Most of the tables contain data deriving from the monthly institutional earnings survey. The scope of statistical observation: all corporations with more than 49 employees are covered by the survey, while corporations with 5–49 employees are observed on a representative basis. Budgetary institutions are observed on a full-scope basis, and also some non-profit institutions supply data.
From 2008 onwards the European Union prescribed for each Member State (Regulation (EC) No 1893/2006) the compulsory use of the new classification of economic activities (NACE '08) in statistical data collections and registries. Since January 2008 data have been collected on the basis of NACE '08 but data referring to 2008 are published in accordance with NACE '03.
The initial application of NACE'08 may influence the processing of statistical data to a certain extent, since until the end of June 2008 there was a possibility for data suppliers to classify their activities according to the new nomenclature. Thus, until the middle of the year, refinements to the classification of activities by data suppliers may have led to transfers between classes, and to discrepancies even at national level due to the fact that the sample reflects better the real activities of economic units.
Data published in this publication are preliminary therefore they can differ from the previously published ones because of data revisions. Revisions are validated quarterly. Revised data are published in the releases of reference months March, June, September and December. Data of reference year from January are revised in each mentioned case. Differences between the data published with the reference January–November and the data published with the reference January–December are higher than the usual ones due to the introduction of NACE'08.
Full-time employees are persons in employment with an employer for a period exceeding 5 working days (since 1999 for min. 60 hours actually worked according to the work contract), including outworkers and those who are working members of partnerships or co-operatives and get salary (wage) for the work done. In full-time employment the compulsory (daily, weekly, monthly) working time is equal with that defined in the Labour Code or laid down in rules for labour relations and it is equal with the working time generally specific for the given employer.
Part-time workers are those working in part-time, apprentices, paid workers as well as students engaged.
Earnings (by national concept) refer to persons employed full-time. Earnings comprise the basic wages and salaries, supplements, wages in kind, bonuses, premiums, 13th month salary and payments for time not worked.
Nominal wages, i.e. earnings in accordance with the SNA-concept, involve direct remuneration and bonuses, payments for time not worked and benefits in kind.
Net earnings (by national concept) derive from gross earnings at enterprise level after subtracting employee's contribution, personal income tax, and compulsory social security contribution (incorporating health contributions and retirement schemes).
Real income index is estimated as the ratio of net income index to the consumer price index.
Manual workers are persons with occupations classified by the ISCO-88 in major groups 5–9.
Non-manual workers are persons with occupations classified by the ISCO-88 in major groups 1–4.