The 2010 CIA World Factbook

by United States. Central Intelligence Agency

Bolivia
17.5% of GDP (2010 est.)

Botswana
28.2% of GDP (2010 est.)

Brazil
18.5% of GDP (2010 est.)

Bulgaria
22.8% of GDP (2010 est.)

Burkina Faso
19.7% of GDP (2010 est.)

Burma
15.1% of GDP (2010 est.)

Burundi
25.1% of GDP (2010 est.)

Cambodia
20.9% of GDP (2010 est.)

Cameroon
21.1% of GDP (2010 est.)

Canada
22.1% of GDP (2010 est.)