The 2003 CIA World Factbook

by United States. Central Intelligence Agency

Portugal
2.553 billion cu m (2001 est.)

Puerto Rico
630 million cu m (2001 est.)

Qatar
0 cu m (2001 est.)

Romania
5.4 billion cu m (2001 est.)

Russia
32.7 billion cu m (2001 est.)

Saudi Arabia
0 cu m (2001 est.)

Senegal
0 cu m (2001 est.)

Serbia and Montenegro
0 cu m (2001 est.)

Singapore
2.5 billion cu m (2001 est.)

Slovakia
7.205 billion cu m (2001 est.)