Region
United States
United States --
23
United states --
7
Developing countries --
3
Developing countries
2
Middle East
2
Middle East --
2
Soviet Union
2
Soviet Union --
2
Afghanistan
1
Afghanistan --
1
Africa
1
Africa --
1
Asia
1
Asia --
1
Caribbean Area
1
Caribbean Area --
1
China
1
China --
1
Europe, Eastern
1
Europe, Eastern --
1
Foreign countries
1
Iran
1
Iran --
1
Japan
1
Japan --
1
Latin America
1
Latin America --
1
South Asia
1
South Asia --
1
Turkey
1
Turkey --
1