Region
Balkan Peninsula
1
Berlin (Germany)
2
China
1
Communist countries
3
Czechoslovakia
3
Developing countries
1
Eastern Europe
2
Europe
10
Europe, Central
7
Europe, Eastern
European Union countries
2
Former Soviet republics
5
Germany
5
Germany (East)
2
Germany (West)
2
Hungary
1
Poland
1
Russia
3
Russia (Federation)
6
Southeast Asia
1
Soviet Union
17
Ukraine
1
United States
8