Region
United States
6
United States - --
6
United States --
3
Soviet Union
2
Central America
1
Central America - --
1
China
1
China - --
1
China --
1
Developing countries
1
Developing countries - --
1
Great Britain - --
1
Great Britain --
1
Israel
1
Israel - --
1
Israel --
1
South Asia
1
South Asia --
1
Soviet Union - --
1
Soviet Union --
1
Spain - --
1
United Nations
1