Region
United States --
81
United States
38
Soviet Union --
19
United states --
14
Great Britain --
12
Soviet Union
11
Japan --
10
Great Britain
8
Germany --
6
China --
5
Developing countries --
5
Europe --
5
Developing countries
4
France
4
France --
4
Germany
4
China
3
Europe
3
India --
3
Russia
3
Russia (Federation)
3
Russia (Federation) --
3
Russia --
3
India
2
Japan
2
Korea (North)
2
Korea (North) --
2
New York
2
New York (State) --
2
Pacific area --
2
Taiwan
2
Taiwan --
2
United State --
2
Yugoslavia --
2
Africa
1
Africa --
1
Africa, Southern --
1
Asia --
1
Asia, Southeastern
1
Asia, Southeastern --
1
Baltic States --
1
Baltic states
1
Brazil --
1
Canada
1
Caribbean Area --
1
Eurasia --
1
Europe, Central
1
Europe, Eastern
1
Finland
1
Finland --
1
more ...