Region
United States
13
Developing countries
10
Soviet Union
4
Europe
3
Great Britain
3
China
2
Europe, Eastern
2
European Union countries
2
Germany
2
India
2
Japan
2
Africa, Sub-Saharan
1
Asia
1
Communist countries
1
Darfur
1
Darfur (Sudan)
1
France
1
Hungary
1
Kenya
1
Poland
1
Russia (Federation)
1
South Africa
1
Sudan
1
Technological innovations
1
Ukraine
1
Underdeveloped areas
1