Region
United States --
9
United States
8
Arab countries --
2
Europe
2
Europe --
2
Arab countries
1
Asia --
1
Bosnia and Hercegovina --
1
Bosnia and Herzegovina
1
China
1
China --
1
Developing countries
1
Developing countries --
1
Egypt --
1
Germany
1
Germany --
1
Malaysia
1
Soviet Union
1
Soviet Union --
1
Vietnam
1
Vietnam --
1