The National Statistical Service of Greece is a General Secretariat of the Ministry of Economy and Finance. The statistics compiled by the NSSG - monthly, trimestrial, annual, quinquennial and decennial - cover almost all the activity sectors.Population data (population by different categories, vital statistics - marriages - births - deaths), employment and unemployment data, data concerning health and social insurance, education, justice, the production process, finance, prices, the national income and, finally, the cultural activities consist the main input for the derivation of statistical tables and indices compiled by the NSSG on a short-term and long-term basis.