Region
United States
31
Japan
22
East Asia
13
Europe
13
Developing countries
10
Germany
9
Asia
7
China
7
Southeast Asia
7
European Union countries
4
France
4
Germany (West)
4
Great Britain
4
Korea (South)
4
European Economic Community countries
3
Australia
2
Canada
2
Denmark
2
Europe, Central
2
Europe, Eastern
2
Finland
2
Ireland
2
Israel
2
Mexico
2
Middle East
2
Saudi Arabia
2
South Africa
2
Syria
2
Yemen (Republic)
2
Africa, Southern
1
Africa, Sub-Saharan
1
Arab countries
1
Argentina
1
Australie
1
Austria
1
Brazil
1
Etats-Unis
1
Europe, Southern
1
Europe, Western
1
Former Soviet republics
1
Hong Kong (China)
1
India
1
Italy
1
Japon
1
Latin America
1
Mediterranean Region
1
Mexican-American Border Region
1
New Zealand
1
Princeton <NJ, 1993>
1
Russia (Federation)
1
more ...