Region
United States --
22
United States
20
China
3
China --
3
East Asia --
3
Developing countries
2
Developing countries --
2
Asia
1
Asia --
1
Egypt
1
India
1
India --
1
Indonesia --
1
Italy --
1
Japan
1
Japan --
1
Korea (North)
1
Korea (North) --
1
Libya --
1
Malaysia --
1
Nebraska --
1
Persian Gulf Region --
1
Russia --
1
Sicily
1
Soviet Union
1
Soviet Union --
1
Sudan --
1
United States -Congress -House --
1