Región
Developing countries
Southern Hemisphere
2
United States
2
Africa, West
1
China
1
Commonwealth countries
1
Developed countries
1
English-speaking countries
1
Europe, Eastern
1
European Economic Community countries
1
European Union countries
1
Former communist countries
1
Germany
1
Ghana
1
Great Britain
1
Islamic countries
1
Malaysia
1
Nigeria
1
North America
1
Southern Hempishere
1
Western countries
1