The National Statistical Institute or NSI (Bulgarian: Национален статистически институт or НСИ) is the Bulgarian state agency responsible for the collection and dissemination of statistical data on the population, economy and environment of the country. It reports directly to the Prime Minister of the country. The National Statistical Institute was established in 1880 as a Department of the Ministry of Finance. It carried out the first census of the population in 1881. In 1894, the Department becomes part of the Ministry of Trade and Agriculture. In 1910, the agency published its first annual statistical report, "Statistical Yearbook of the Kingdom of Bulgaria".
1880 A Statistical Division was established at the Ministry of Justice (January 21st 1880 )
1880 A Statistical Organizational Division was formed at the Ministry of Finance (June 25th, 1880)
1880 The beginning of the Population censuses in Principality of Bulgaria was established with the Law of 13 December 1880
1881 The first Population census was conducted on 1st January 1881
1881 The Bulgarian Official Statistical Office was created .The Statistical Division turned into independent Statistical Office
1896 The first Census of the Civil Servants was conducted
1897 A Law on the Statistics Directorate in the Principality of Bulgaria and a Law on Population Census, Housing and Livestock
1897 For the first time a Census of Land Property in Bulgaria was conducted
1907 A Law on the Statistics Directorate General in the Bulgarian Kingdom
1908 Issued a publication “Monthly Statistical Reviews “
1909 The first Census in Industry was carried out
1910 Published the first Statistical Yearbook
1925 Conducted the first Household Budgets Survey
1926 The first General Economic Census was conducted, together with the Population Census during the same year. For first time in
Europe a sampling method for quick aggregation of the results from General Agricultural Farms Census was used
1929 The first specialized magazine of the Statistics Directorate General started. Nowadays it comes out under the name of “Statistics Journal”
1934 The agricultural survey was carried out with using a sample method for the first time in the data collection phase
1946 A Law on the Organization of Statistics in Bulgaria -The Statistics Directorate General passed over to the Council of Ministers. A network of local statistical bodies was created for the first time
1953 A Central Statistical Office at the Council of Ministers as a state authority to manage the overall statistical activity in the country was created
1991 A Law on Statistics – the National Statistical Institute (NSI) was created