Region
Soviet Union --
220
Soviet Union
175
United States --
74
United States
67
China
26
China --
25
Asia
13
Asia --
12
Developing countries
10
Europe --
10
Europe, Eastern
10
Europe
9
Europe, Eastern --
9
Middle East
8
Middle East --
8
India
7
India --
7
Asia, Southeastern
6
Asia, Southeastern --
6
Japan
6
Japan --
6
Russia (Federation) --
6
Developing countries --
5
East Asia --
5
Pacific Area
5
Russia (Federation)
5
Afghanistan --
4
East Asia
4
Pacific Area --
4
Russia
4
Russia --
4
Great Britain
3
Great Britain --
3
Israel
3
Israel --
3
Pakistan
3
Pakistan --
3
Syria
3
Syria --
3
United states --
3
Yugoslavia
3
Yugoslavia --
3
Afghanistan
2
Africa
2
Africa --
2
Eastern Europe
2
Germany
2
Germany --
2
Singapore
2
Singapore --
2
more ...