The 2008 CIA World Factbook

by United States. Central Intelligence Agency

Sierra Leone
2.3% of GDP (2006)

Singapore
4.9% of GDP (2005 est.)

Slovakia
1.87% of GDP (2005 est.)

Slovenia
1.7% of GDP (2005 est.)

Solomon Islands
3% of GDP (2006)

Somalia
0.9% of GDP (2005 est.)

South Africa
1.7% of GDP (2006)

Spain
1.2% of GDP (2005 est.)

Sri Lanka
2.6% of GDP (2006)

Sudan
3% of GDP (2005 est.)