Region
United States
220
Developing countries
66
Europe
50
China
49
Great Britain
46
Japan
22
Germany
19
France
13
Africa
12
Soviet Union
11
Europe, Eastern
10
India
10
Latin America
10
Canada
8
Russia (Federation)
8
Washington (D.C.)
8
East Asia
7
Southern States
7
Taiwan
7
Afghanistan
6
Korea (South)
6
États-Unis
6
Germany (West)
5
Italy
5
Middle East
5
New York (State)
5
America
4
Appalachian Region
4
Asia
4
Brazil
4
California
4
Developed countries
4
England
4
European Economic Community countries
4
Greece
4
Netherlands
4
Rome
4
Allemagne
3
Australia
3
Caribbean Area
3
Grande-Bretagne
3
Kentucky
3
Korea
3
Las Vegas
3
Las Vegas (Nev.)
3
Malaysia
3
Missouri
3
Nevada
3
New York
3
New York (N.Y.)
3
more ...