Subject Region
United States
16
Great Britain
13
Developing countries
9
England
7
Asia
4
Europe
4
East Asia
3
Japan
3
Canada
2
Europe, Eastern
2
Africa
1
Argentina
1
Asia, Central
1
Bangladesh
1
Colombia
1
East Indies
1
Europe, Central
1
European Union countries
1
Former Soviet republics
1
Germany
1
Kazakhstan
1
Korea (South)
1
Kyrgyzstan
1
Nepal
1
Oceania
1
Pacific Area
1
Qatar
1
Scotland
1
South Asia
1
Spain
1
Sri Lanka
1
Tajikistan
1