The 2009 CIA World Factbook

by United States. Central Intelligence Agency

Serbia
20.1% of GDP (2007 est.)

Seychelles
13.7% of GDP (2008 est.)

Singapore
28.5% of GDP (2008 est.)

Slovakia
25.9% of GDP (2008 est.)

Slovenia
28% of GDP (2008 est.)

South Africa
23.2% of GDP (2008 est.)

Spain
29.4% of GDP (2008 est.)

Sri Lanka
24.5% of GDP (2008 est.)

Sudan
18.1% of GDP (2008 est.)

Swaziland
18.8% of GDP (2008 est.)