Region
United States
86
India
9
Europe
7
Developing countries
6
China
4
Japan
4
Asia
3
East Asia
3
Europe, Eastern
3
Great Britain
3
Africa
2
Europe, Central
2
Former Soviet republics
2
Middle East
2
Adriatic Sea Region
1
Africa, North
1
Assyria
1
Canada, Western
1
Chesapeake Bay Watershed
1
Colombia
1
Communist countries
1
European Economic Community countries
1
Germany
1
Germany (West)
1
Hawaii
1
Mexico
1
Ohio
1
Pacific Area
1
Persian Gulf Region
1
Québec (Province)
1
Russia (Federation)
1
Technological innovations
1