Region
United States
121
Soviet Union
4
Africa
2
China
2
Russia (Federation)
2
Botswana
1
California, Southern
1
Caribbean Area
1
Chile
1
Developing countries
1
European Economic Community countries
1
Idaho
1
India
1
Iran
1
Iraq
1
Latin America
1
Mexican-American Border Region
1
Minnesota
1
New Mexico
1
Oceania
1
Pennsylvania
1
South Africa
1
South China Sea
1
Thailand
1
Washington (D.C.)
1
Wisconsin
1
Wyoming
1
Zimbabwe
1