Region
Soviet Union
Soviet Union --
102
United States --
48
United States
47
Developing countries
9
Europe, Eastern
8
Europe, Eastern --
8
China
7
Asia
6
Europe --
6
Middle East
6
Middle East --
6
Asia --
5
China --
5
Europe
5
East Asia --
4
Japan --
4
Developing countries --
3
East Asia
3
India
3
India --
3
Israel
3
Israel --
3
Japan
3
Pakistan
3
Pakistan --
3
Russia
3
Syria
3
Syria --
3
Asia, Southeastern
2
Asia, Southeastern --
2
Eastern Europe
2
Great Britain
2
Great Britain --
2
Pacific Area
2
Russia (Federation)
2
Russia (Federation) --
2
Russia --
2
United states --
2
Yugoslavia
2
Yugoslavia --
2
Afghanistan --
1
Africa, Northeast
1
Africa, Northeast --
1
Austria --
1
Baltic States
1
Cuba
1
Cuba --
1
Czechoslovakia
1
Czechoslovakia --
1
more ...