These may be physical measurement units such as tonnes, liters, kilos, pieces, square meters, or value data deflated by appropriate price indices. Every five years. Judgmental on the base of statistical survey results and recommendations by industrial organizations and the Ministry of Industry and Trade. Compulsory mail questionnaire sent by the CSO to individual enterprises. Weighted arithmetic average of individual representative items' quantity relatives according to the Laspeyres formula.
Same products reported by different enterprises each have their own, specific weights.
Weighted arithmetic average of quantity relatives according to the Laspeyres formula. Time series analysis of individual representative items. Possible discrepancies are solved by contacting the producer, or consulting industrial organizations. Exactness of weights is verified once in a year.