The Brazilian Institute of Geography and Statistics or IBGE (Portuguese: Instituto Brasileiro de Geografia e Estatística), is the agency responsible for statistical, geographic, cartographic, geodetic and environmental information in Brazil. The IBGE performs a national census every ten years, and the questionnaires account for information such as age, household income, literacy, education, occupation and hygiene levels. IBGE is an institution of the Federal Government, constituted a public foundation by Decree Law No. 161 of February 13, 1967, and is bound to the Brazilian Department of Planning, Budget and Management. It has four directors and two other central organs. IBGE has a network of national research and dissemination components, comprising: 27 state units (26 in state capitals and one in the Federal District); 27 centres for documentation and dissemination of information (26 in the capital and one in the Federal District); 581 data collection agencies in major cities. The IBGE also maintains the Roncador Ecological Reserve, situated 35 km south of Brasília.