Oblast
United States
13
Great Britain
7
Germany
6
Europe
4
China
3
Developing countries
2
Iran
2
Mexico
2
Africa
1
Chile
1
Czechoslovakia
1
Developed countries
1
European Union countries
1
France
1
Germany (West)
1
Harlem (New York, N.Y.)
1
India
1
Italy
1
Japan
1
Nicaragua
1
Philippines
1
Slovakia
1
South Asia
1
Switzerland
1
Turkey
1