The 2008 CIA World Factbook

by United States. Central Intelligence Agency

Serbia
20.1% of GDP (2007 est.)

Seychelles
8.9% of GDP (2007 est.)

Singapore
24.9% of GDP (2007 est.)

Slovakia
25.7% of GDP (2007 est.)

Slovenia
28.7% of GDP (2007 est.)

South Africa
20.6% of GDP (2007 est.)

Spain
31.1% of GDP (2007 est.)

Sri Lanka
24.7% of GDP (2007 est.)

Sudan
19% of GDP (2007 est.)

Swaziland
18.6% of GDP (2007 est.)