Households data are compiled from the household budget surveys and crosschecked with retail turnover data. The two main sources of data on government transactions are the half-yearly accounts provided by the Ministry of Finance and the monthly report on revenue and expenditure of the national budget. The data on gross fixed capital formation and stocks for corporations are taken from regular surveys of establishments and enterprises. The main source of data for foreign trade transactions is the balance of payments, including the data on imports and exports of goods and services that are compiled from customs statistics. Estimates of gross output and intermediate consumption in current prices are compiled using mainly primary data sources.
Gross value added is derived as the difference between gross output and intermediate consumption.
Several adjustments are made to account for undercoverage and non-reporting. Constant price estimates are derived from double deflation of gross output and intermediate consumption using appropriate price indices. Overall, deflation is done at the level of 29 OKEC categories and subcategories. For agriculture, the estimates of gross production and intermediate consumption in constant prices are obtained through deflation using the price index of agricultural products at detailed level. For forestry, 'green wood' price index is used for deflation.