Region
United States
271
Great Britain
82
Developing countries
74
Europe
63
China
52
Germany
28
Japan
22
France
17
Africa
16
India
13
Canada
11
Latin America
11
Soviet Union
11
Europe, Eastern
10
Russia (Federation)
9
Australia
8
East 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
États-Unis
6
America
5
Middle East
5
New York (State)
5
Appalachian Region
4
Asia
4
Brazil
4
California
4
Developed countries
4
European Economic Community countries
4
Hungary
4
Ireland
4
Mexico
4
Netherlands
4
Rome
4
Russia
4
Spain
4
Sweden
4
Allemagne
3
Caribbean Area
3
Grande-Bretagne
3
Indian Ocean
3
Kentucky
3
more ...