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