Region
Africa
1
Asia
3
Benin
1
Canada
9
China
15
Colombia
2
Delaware
1
Developing countries
1
East Asia
5
Europe
5
Europe, Central
2
Europe, Eastern
2
European Union countries
3
Finland
2
Former Soviet republics
2
France
2
Germany
3
India
4
Ireland
2
Japan
3
Latin America
1
Maryland
1
Massachusetts
1
Mexican-American Border Region
1
Mexico, Gulf of
1
Netherlands
1
New Castle County
1
New Hampshire
2
OECD countries
1
Outer space
2
Pacific Area
1
Prussia
2
Prussia (Germany)
1
Russia (Federation)
4
South Africa
1
Spain
1
Thailand
1
United States
578
États-Unis
1