Region
Soviet Union --
Soviet Union
104
United States --
53
United States
48
Developing countries
9
Europe, Eastern
9
Europe, Eastern --
9
Asia
7
Middle East
7
Middle East --
7
Asia --
6
China
6
China --
6
Europe --
6
Europe
5
East Asia --
4
India
4
India --
4
Russia (Federation) --
4
Russia --
4
Developing countries --
3
East Asia
3
Israel
3
Israel --
3
Japan
3
Japan --
3
Russia
3
Syria
3
Syria --
3
United states --
3
Asia, Southeastern
2
Asia, Southeastern --
2
Eastern Europe
2
Great Britain
2
Great Britain --
2
Pacific Area
2
Pakistan
2
Pakistan --
2
Russia (Federation)
2
Yugoslavia
2
Yugoslavia --
2
Afghanistan --
1
Africa, Northeast
1
Africa, Northeast --
1
Africa, Southern --
1
Asia - --
1
Austria --
1
Baltic States
1
Caribbean Area --
1
Cuba
1
more ...