Region
United States
73
European Union countries
9
China
7
Russia (Federation)
7
Developing countries
6
Latin America
6
California
5
Asia
3
Canada
3
Europe, Eastern
3
Germany
3
Great Britain
3
Mexico
3
Tehuantepec, Isthmus of
3
Azerbaijan
2
East Asia
2
Asia, Central
1
Australia
1
Cameroon
1
Eurasia
1
Europe
1
Europe, Western
1
Former Soviet republics
1
India
1
Japan
1
Kola Peninsula
1
Korea (North)
1
Louisiana
1
Mediterranean Region
1
Middle East
1
Mississippi
1
New Mexico
1
Philippines
1
South America
1
Southeast Asia
1
Texas
1
Ukraine
1
Venezuela
1
West (U.S.)
1