Fantastic Interactive Page on Immigration

See http://peoplemov.in/

If you click on the Right side for Sri Lanka we get

Immigrants: 339,915  % of population: 1.61%

INDIA           336,352
AUSTRALIA           436
FRANCE              425
UNITED KINGDOM      412
CHINA               316
SWEDEN              253
MALAYSIA            190
GERMANY             185
USA                 159
PAKISTAN            133

If you click on the Right side for Sri Lanka we get

Emigrants: 1,847,829  % of population: 8.76%

Migrant destinations 

SAUDI ARABIA         391,173
KUWAIT               208,893
INDIA                161,472
UNITED ARAB EMIRATES 161,068
CANADA               123,012
UNITED KINGDOM       113,448
JORDAN               102,709
QATAR                 87,727
ITALY                 79,400
AUSTRALIA             78,098