Region
Asia
2
Balkan Peninsula
1
Communist countries
1
East Asia
2
Europe
Europe, Central
1
Europe, Eastern
6
Europe, Western
8
European Union countries
2
France
5
Germany
9
Germany (East)
1
Germany (West)
3
Great Britain
4
Greece
1
Hungary
1
Middle East
2
Norway
1
Poland
1
Russia
3
Russia (Federation)
1
Slovakia
1
Soviet Union
8
United States
32