Region
Developing countries
56
China
44
United States
35
France
10
Europe
8
Germany
7
Japan
7
Italy
6
Latin America
4
Mexico
4
Middle East
4
Singapore
4
Africa, North
3
India
3
Africa, Sub-Saharan
2
America
2
Asia
2
Australia
2
Bangladesh
2
Caribbean Area
2
Iraq
2
Korea (South)
2
Palestine
2
Peru
2
Poland
2
Romania
2
Soviet Union
2
Spain
2
Syria
2
Africa
1
Africa, French-speaking
1
Angola
1
Arab countries
1
Bulgaria
1
Canada
1
Communist countries
1
Cuba
1
Germany (West)
1
Government policy
1
Great Britain
1
Haiti
1
Hebei Sheng
1
Hong Kong
1
Hong Kong (China)
1
Kenya
1
Madagascar
1
Netherlands
1
New Zealand
1
Portugal
1
Russia (Federation)
1
more ...