Region
OECD countries
49
Europe
30
Europe, Eastern
15
Asia
13
Russia (Federation)
13
Developing countries
11
Eastern Europe
11
Korea (South)
11
China
10
Europe, Central
10
Italy
10
Mexico
10
Poland
10
Belgium
9
Hungary
9
Spain
9
Canada
8
Japan
8
Luxembourg
8
Switzerland
8
Sweden
7
Bulgaria
6
Central Europe
6
Iceland
6
Africa
5
Brazil
5
France
5
Greece
5
Korea
5
Netherlands
5
Turkey
5
United States
5
Yugoslavia
5
Chile
4
East Asia
4
Germany
4
Great Britain
4
Ireland
4
Kazakhstan
4
New Zealand
4
Norway
4
Portugal
4
Romania
4
Australia
3
Austria
3
Colombia
3
Czech Republic
3
Denmark
3
Egypt
3
Germany (West)
3
more ...