The 2009 CIA World Factbook

by United States. Central Intelligence Agency

Brazil
19% of GDP (2008 est.)

Bulgaria
33.4% of GDP (2008 est.)

Burkina Faso
19.6% of GDP (2008 est.)

Burma
14.1% of GDP (2008 est.)

Burundi
12.5% of GDP (2008 est.)

Cambodia
22.4% of GDP (2008 est.)

Cameroon
17.7% of GDP (2008 est.)

Canada
22.6% of GDP (2008 est.)

Cape Verde
41.6% of GDP (2008 est.)

Chad
13.7% of GDP (2008 est.)