The source of published data is National Official Business Register REGON run by the President of the Central Statistical Office in compliance with the provisions of the Law of 29 June 1995 on official statistics (Journal of Laws No 88, item 439 as amended) and the regulation of the Council of Ministers of 27 July 1999 on the mode and methodology of running and actualisation of business register, including application, questionnaire and certificate specimens and detailed conditions and mode of cooperation of official statistics services with other bodies running official registers and information systems in public administration (Journal of Laws No 69, item 763, as amended).