Official statistics from the European Union.
General economic & worldwide statistics from the Organisation for Economic Co-operation and Development.
United Nations Statistics Division
Worldwide statistics from the United Nations Statistics Divison (UNSD).
United Nations Demographic Yearbook
UN Demographic Yearbook from 1948
United Nations Statistical Yearbook
Current Statistical Yearbook and previous editions from the 50th edition 2006.
World Development Indicators (World Bank)
Worldwide country statistical data.