Region
Europe, Eastern
21
Russia (Federation)
13
Europe, Central
6
Europe
4
Former Soviet republics
4
Soviet Union
4
China
3
Former communist countries
2
Poland
2
Africa South of the Sahara
1
Africa, Sub-Saharan
1
Asia
1
Communist countries
1
Czech Republic
1
Hungary
1
Kazakhstan
1
Latin America
1
Latvia
1
Saint Petersburg
1
Ukraine
1