Region
United States
13
Australia
6
China
4
États-Unis
4
Asia
3
Developing countries
3
Great Britain
3
OECD countries
3
Romania
3
Argentina
2
Brazil
2
Canada
2
Colombia
2
Europe
2
France
2
Germany
2
India
2
Korea (South)
2
New Zealand
2
Russia (Federation)
2
Thailand
2
Vietnam
2
2
1
Algeria
1
Australie
1
Bahrain
1
Bangladesh
1
Cameroon
1
Chile
1
Communist countries
1
Czechoslovakia
1
Eastern Europe
1
Egypt
1
Etats-Unis d'Amérique
1
Europe, Eastern
1
Ghana
1
Greece
1
Indonesia
1
Iran
1
Ireland
1
Italy
1
Japan
1
Kazakhstan
1
Malaysia
1
Mexico
1
Morocco
1
Mozambique
1
New England
1
Nigeria
1
Northeastern States
1
more ...