Oblast
Developing countries
25
China
12
United States
9
East Asia
6
European Union countries
6
Latin America
6
Europe, Eastern
5
Europe
3
Germany
3
Japan
3
Mexico
3
Africa
2
Asia
2
Brazil
2
Former Soviet republics
2
India
2
Korea (South)
2
Russia (Federation)
2
Soviet Union
2
Africa, North
1
Africa, West
1
Argentina
1
Austria
1
Balkan Peninsula
1
Bulgaria
1
Chile
1
Communist countries
1
Ecuador
1
Europe, Central
1
Former communist countries
1
France
1
Germany (West)
1
Great Britain
1
Hungary
1
Jordan
1
Korea (North)
1
Kosovo (Republic)
1
Middle East
1
Slovakia
1
South Africa
1
South Asia
1
Switzerland
1
Turkey
1
Yugoslavia
1