Region
Asia
1
Australia
2
Brazil
1
Canada
1
Caribbean Area
2
Chicago
1
China
3
Developed countries
1
England
1
Europe
5
European Union countries
3
Finland
1
Germany (West)
2
Great Britain
2
Illinois
2
India
1
Italy
1
Japan
3
Korea (South)
1
London
1
Mexican-American Border Region
3
Norway
1
OECD countries
2
Pennsylvania
1
Philadelphia
1
Pune
1
Québec (Province)
1
Soviet Union
1
Sweden
1
United States
60