Region
United States --
4
Former Soviet republics --
3
United States
3
Europe --
2
Germany (West)
2
Germany (West) --
2
Russia (Federation) --
2
Asia
1
Asia --
1
Asia, Central --
1
Canada
1
China
1
China --
1
Europe
1
Former Soviet Republics
1
Former Soviet republics
1
Great Britain
1
Great Britain --
1
Iran
1
Iran --
1
Japan
1
Japan --
1
Russia (Federation)
1
Russia --
1
Russia(Federation) --
1
South Africa --
1
Soviet Union --
1