Region
United States --
20
United States
14
China --
13
Great Britain --
11
India --
11
Europe --
10
Soviet Union --
10
Europe, Eastern --
9
Middle East --
9
Great Britain
7
South Africa --
7
India
6
Iran --
6
Philippines --
6
South Africa
6
Philippines
5
Austria --
4
France --
4
Germany --
4
Japan --
4
Kenya --
4
Mexico --
4
Pakistan --
4
Africa --
3
China
3
Cuba --
3
Czechoslovakia --
3
Ethiopia --
3
France
3
Germany
3
Mozambique --
3
Nicaragua --
3
Soviet Union
3
Sri Lanka
3
Sri Lanka --
3
Taiwan --
3
Turkey --
3
Vietnam --
3
Afghanistan --
2
Argentina --
2
Asia, Southeastern --
2
Egypt --
2
Ethiopia
2
Europe
2
Europe, Eastern
2
Germany (East) --
2
Ghana --
2
Hungary --
2
Iran
2
Kenya
2
more ...