The 2009 CIA World Factbook

by United States. Central Intelligence Agency

Burkina Faso
4.2% of GDP (2006)

Burma
1.2% of GDP (2001)

Burundi
5.1% of GDP (2005)

Cambodia
1.7% of GDP (2004)

Cameroon
3.3% of GDP (2006)

Canada
5.2% of GDP (2002)

Cape Verde
6.3% of GDP (2006)

Cayman Islands
2.8% of GDP (2005)

Central African Republic
1.4% of GDP (2006)

Chad
1.9% of GDP (2005)