This paper measures and analyzes levels and trends in the intensity and spatial impact of internal migration based on census data from the 1990, 2000 and 2010 rounds of census. Migration intensities tend to be highest in the new world countries of Australia, Canada, New Zealand and the United States of America, and lowest in Asia. Intensities in Europe, Latin America and Africa stand at intermediate levels, but with considerable intra-regional diversity. The authors estimate that at the global level, as of 2005, there were approximately 763 million persons living within their own country but outside their region of birth. Internal migration has redistributed a sizable proportion of the national population across major regions.
URL : http://www.un.org/en/development/desa/population/publications/pdf/technical/TP2013-1.pdf