Region
United States
550
China
23
European Union countries
19
Developing countries
11
Africa
9
Asia
9
Latin America
9
Russia (Federation)
9
Europe
8
India
8
California
7
Great Britain
7
Europe, Eastern
6
Mexico
6
Texas
6
Louisiana
5
Canada
4
Germany
4
Soviet Union
4
Ukraine
4
West Virginia
4
Asia, Central
3
East Asia
3
Former Soviet republics
3
Indonesia
3
Iran
3
Japan
3
Middle East
3
North America
3
Pacific Area
3
Southeast Asia
3
Tehuantepec, Isthmus of
3
West (U.S.)
3
Azerbaijan
2
Bengal, Bay of
2
Bulgaria
2
Caspian Sea Region
2
Colorado
2
Guatemala
2
Houston
2
Kenya
2
South America
2
Trinidad
2
Trinidad and Tobago
2
Africa, North
1
Africa, Sub-Saharan
1
Alaska
1
Australia
1
Brazil
1
Cameroon
1
more ...