Region
United States
273
Great Britain
87
Developing countries
76
Europe
65
China
52
Germany
30
Japan
23
France
17
Africa
16
India
14
Canada
11
Europe, Eastern
11
Latin America
11
Soviet Union
11
Australia
9
East Asia
9
Russia (Federation)
9
Asia
8
Italy
8
Washington (D.C.)
8
Austria
7
Germany (West)
7
Southern States
7
Taiwan
7
Afghanistan
6
England
6
Greece
6
Korea (South)
6
Middle East
6
États-Unis
6
America
5
Brazil
5
New York (State)
5
Spain
5
Appalachian Region
4
California
4
Developed countries
4
European Economic Community countries
4
Hungary
4
Ireland
4
Mexico
4
Netherlands
4
Rome
4
Russia
4
Sweden
4
Allemagne
3
Caribbean Area
3
Grande-Bretagne
3
Indian Ocean
3
Kentucky
3
more ...