Region
United States
19
Soviet Union
16
Germany (West)
5
United States --
5
East Asia
3
Europe
3
Iran
3
South Asia
3
Soviet Union --
3
Former Soviet Republics
2
India
2
Middle East
2
Arctic region
1
Canada
1
Canada --
1
Europe --
1
Former Soviet Rebuplics
1
Former Soviet republics
1
India --
1
Iran --
1
Iraq
1
Iraq --
1
Korea (North)
1
Korea (North) --
1
Korea (South)
1
Korea (South) --
1
Malaysia
1
Pakistan
1
Scandinavia --
1