In July 2003 the OECD launched a data collection in collaboration with national statistical offices of OECD countries, to obtain statistics on the foreign-born population for each OECD country by country of birth and educational attainment. The data were obtained in most cases from the 2000 round decennial population censuses. All but one OECD country participated in the project.

The database makes it possible to provide, for the first time, a comprehensive picture of migration to each OECD country over recent decades as well as a picture of brain drain / brain exchange both within OECD countries and from non-OECD countries to the OECD area. The data can be aggregated by either sending or receiving countries, thus allowing for statistics on expatriation, on the one hand, and on the size and composition of immigrant populations, on the other. The output also includes cumulative emigration rates of persons with tertiary attainment for about one hundred countries.

The available output is as follows and can be obtained by clicking on the appropriate item:

• Some basic results: "Counting Immigrants and Expatriates in OECD Countries: A New Perspective"
• Database on immigrants and expatriates