The 2009 CIA World Factbook

by United States. Central Intelligence Agency

Burundi
5.9% of GDP (2006 est.)

Cambodia
3% of GDP (2005 est.)

Cameroon
1.3% of GDP (2006)

Canada
1.1% of GDP (2005 est.)

Cape Verde
0.7% of GDP (2005)

Central African Republic
1.1% of GDP (2006 est.)

Chad
4.2% of GDP (2006)

Chile
2.7% of GDP (2006)

China
4.3% of GDP (2006)

Colombia
3.4% of GDP (2005 est.)