National agencies responsible for GDP measurement
Within each country GDP is normally measured by a national government statistical agency, as private sector organizations normally do not have access to the information required (especially information on expenditure and production by governments). Algeria: Office of National Statistics Argentina: National Institute of Statistics and Census of Argentina Albania: Institute of Statistics (Instituti nderkombetare i statistikave).
Source: Wikipedia — National agencies responsible for GDP measurement (CC BY-SA 4.0)