The Penn World Table
http://pwt.econ.upenn.edu/php_site/pwt_index.php

The Penn World Table provides purchasing power parity and national income accounts converted to international prices for 189 countries/territories for some or all of the years 1950-2010. The European Union or the OECD provide more detailed purchasing power and real product estimates for their countries and the World Bank makes current price estimates for most PWT countries at the GDP level. This will be added to the tools section of Research Resources Subject Tracer™. This will be added to International Trade Resources Subject Tracer™. This has been added to Business Intelligence Resources Subject Tracer™.