Region
Africa, North
1
Alaska
4
America
2
Arab countries
1
Asia
1
Brazil
2
California
1
Canada
6
Colombia
1
Denmark
1
Developing countries
6
Europe
2
European Economic Community countries
2
Former Soviet republics
1
Gabon
1
Germany
1
Iran
4
Iraq
3
Israel
1
Kansas
3
Maryland
1
Mexico
3
Middle East
5
Nevada
2
North America
1
Northeastern States
1
Ontario
2
Oregon
1
Philippines
2
Qatar
1
Rhode Island
1
Russia (Federation)
2
Saudi Arabia
3
Spain
1
United States
366