The 2008 CIA World Factbook

by United States. Central Intelligence Agency

United Kingdom
2.4% of GDP (2005 est.)

United States
4.06% of GDP (2005 est.)

Uruguay
1.6% of GDP (2006)

Uzbekistan
2% of GDP (2005 est.)

Vanuatu
NA

Venezuela
1.2% of GDP (2005 est.)

Vietnam
2.5% of GDP (2005 est.)

West Bank
NA

World
roughly 2% of GDP of gross world product (2005 est.)

Yemen
6.6% of GDP (2006)