Dissemination is activity undertaken by responsible producers of official statistics in order to present results of official statistics, make them available to users and provide them information on methods and sources that present basis of official statistical results.  

Reference period is a period for which statistical results are collected and calculated and to which, as a results of that, these values relate. The period may be the calendar year (referent year), semi-annual period, quarter or a month. Certain data, as population variables, relate to the certain moment (so called referent time point- for example population on the day 30th December 2011). The reference period should be distinguished from time of statistical data publishing. The year of statistical data issuing  can be significantly later than the reference year for which they were collected.

Gross domestic product (GDP) presents the measure of activities of one country. It is a result of production activities of resident, institutionalized units and it is equal to sum of their added values that are calculated for all institutionalized sectors.  

Annual and semi-annual GDP are calculated in current and constant prices, by production and expenditure approach.

All economic transactions are result of calculation of various amounts of products’ and prices’ production and sale. By summing all certain transactions the total value for a certain period is being obtained. When values of two periods are compared they simultaneously reflect in both prices and quantities. These values are said to be expressed in current prices.

Over time, the general price level changes (increases or decreases) what leads to increase (or decrease)  of current values, even if the volume of goods and services remained unchanged. In order to avoid influence of prices, the calculation in constant prices is being introduced. Constant prices are obtained by combination of quantities of products which are produced or sold in a longer period, with prices from a certain base period. In this way a series of comparable data is being obtained , because all values are expressed in prices of one year. Constant prices are expressed in real growth rates.

The gross domestic product by production approach presents the sum of gross values added of all fields of economy, decreased for services of financial intermediation indirectly measured (FISIM) and increased for net taxes (taxes minus subsidies on products). 

The gross domestic product by expenditure approach is calculated as a sum of expenditures for personal consumption of households, personal consumption of non-profit institutions, which renders services to households (NDIP), expenditures for the state’s individual and collective consumption, gross investments in basic funds, net acquisition of valuables, changes in values of stocks and values of net exports of goods and services.