Ámbito geográfico
United States
11
Developing countries
4
Asia
2
Chile
2
Europe
2
European Union countries
2
Arab countries
1
Armenia
1
Caribbean Area
1
China
1
Colorado River Watershed (Colo.-Mexico)
1
Italy
1
Middle East
1
New York (State)
1
New Zealand
1
North America
1
Pacific Area
1
Rome
1
Santiago
1
West (U.S.)
1