Region
United States
7
United States --
6
Developing countries --
5
China
3
China --
3
Developing countries
2
Europe
2
Arab countries
1
Arab countries --
1
Asia
1
Asia --
1
Europe, Eastern
1
Europe, Eastern --
1
Europe, Southern --
1
Germany (West)
1
Hong Kong - --
1
Indonesia
1
Newly independent states --
1
Nigeria
1
South Africa
1
South Africa --
1