The 2007 CIA World Factbook

by United States. Central Intelligence Agency

Cambodia
18.7% of GDP (2006 est.)

Cameroon
16.8% of GDP (2006 est.)

Canada
21.3% of GDP (2006 est.)

Cape Verde
25.5% of GDP (2006 est.)

Chad
9.2% of GDP (2006 est.)

Chile
21% of GDP (2006 est.)

China
44.3% of GDP (2006 est.)

Colombia
22.8% of GDP (2006 est.)

Congo, Republic of the
27.2% of GDP (2006 est.)

Costa Rica
19.4% of GDP (2006 est.)