Where are the world's biggest Chinese and Indian immigrant communities?

Diasporas

Mapping migration

MORE Chinese people live outside mainland China than French people live in France, with some to be found in almost every country. Some 22m ethnic Indians are scattered across every continent. Diasporas have been a part of the world for millennia. But today their size (if migrants were a nation, they would be the world’s fifth-largest) and the ease of staying in touch with those at home are making them matter much more. No other social networks offer the same global reach—and shrewd firms are taking notice. Our map highlights the world's top 20 destinations for Chinese and Indian migrants.

http://www.economist.com/blogs/dailychart/2011/11/diasporas