Region
Great Britain
16
Europe
7
European Economic Community countries
7
United States
7
China
4
European Union countries
4
California, Northern
3
Massachusetts
3
Canada
2
India
2
Italy
2
South Asia
2
Argentina
1
Balkan Peninsula
1
Developing countries
1
England
1
Europe Union countries
1
Germany
1
Germany (West)
1
Poland
1
Soviet Union
1
Spain
1
Tianjin (China)
1