Región
United States
9
Great Britain
7
India
6
China
5
Europe
5
Italy
4
Soviet Union
4
Developing countries
3
Europe, Eastern
3
Islamic countries
3
Asia
2
Latin America
2
Russia
2
South Africa
2
Southeast Asia
2
Africa
1
Andhra Pradesh
1
Austria
1
Bahrain
1
Berekum
1
Canada
1
East Asia
1
European Union countries
1
Former Soviet republics
1
France
1
Germany
1
Ghana
1
Gujarat
1
Ireland
1
Japan
1
Kuwait
1
Madhya Pradesh
1
Narmada River Valley (India)
1
Nigeria
1
Oman
1
Ontario
1
Poland
1
Québec (Province)
1
Russia (Federation)
1
Sahel
1
Scotland
1
Singapore
1
Spain
1