Region
Europe, Eastern --
13
Europe, Eastern
10
Former Soviet republics --
4
Communist countries --
3
Europe --
3
China
2
China --
2
Europe
2
United States --
2
Asia, Central
1
Asia, Central --
1
Developing countries --
1
East Asia
1
East Asia --
1
European Economic Community countries --
1
European Union countries
1
European Union countries --
1
European, Eastern --
1
Latin America
1
Latin America --
1
Soviet Union
1
Soviet Union --
1
United States
1