The 2006 CIA World Factbook

by United States. Central Intelligence Agency

Nigeria
21.3% of GDP (2005 est.)

Norway
18.7% of GDP (2005 est.)

Oman
14.8% of GDP (2005 est.)

Pakistan
15.3% of GDP (2005 est.)

Panama
16.5% of GDP (2005 est.)

Papua New Guinea
19.2% of GDP (2005 est.)

Paraguay
19.4% of GDP (2005 est.)

Peru
18.9% of GDP (2005 est.)

Philippines
15.5% of GDP (2005 est.)

Poland
18.2% of GDP (2005 est.)