Crossing globalisation's last frontier
Business Times - Singapore
By contrast, labour flow has been more sedate, even if some may point to a rise in the past two decades. Since 1990 (from which year data is available from the Department of Economic and Social Affairs, Population Division of the United Nations), the world's migrant population has moved up from 155 million to 213 million - more than one-third higher. (22 February 2011)