Geographic Subject
Costa Rica
24
Colombia
18
Chile
15
Bolivia
13
Ecuador
6
El Salvador
5
United States
4
Venezuela
4
Dominican Republic
3
Guatemala
3
Mexico
3
Nepal
3
Argentina
2
Asia
2
Brazil
2
China
2
Colombie
2
Cuba
2
India
2
Peru
2
Uruguay
2
États-Unis
2
Bolivie
1
Congo (Democratic Republic)
1
Developing countries
1
Great Britain
1
Honduras
1
Latin America
1
Nicaragua
1
Oceania
1
Panama
1
Paraguay
1
Southeast Asia
1
Soviet Union
1
Unión Soviética
1