Region
Middle East
11
Africa, Sub-Saharan
10
Africa, North
9
China
8
South Asia
8
Asia
7
Europe
7
Soviet Union
6
Europe, Eastern
4
Latin America
4
Pacific Area
4
Sub-Saharan Africa
4
United States
4
Africa
2
Eastern Europe
2
Former Soviet republics
2
North Africa
2
East Asia
1
Middle East Region
1
Oceania
1
Oceania Region
1
Southeast Asia
1