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Datenquelle: BASE - Bielefeld Academic Search Engine
Brazil
24
Canada
China
Japan
24
Singapore
Spain
24
Argentina
20
Austria
20
Bulgaria
20
France
20
Greece
20
Hungary
20
Ireland
20
Italy
20
Poland
20
Portugal
20
Romania
20
Slovakia
20
Africa
16
Arab-Muslim world
16
Asia
16
Bangladesh
16
Belgium
16
Bolivia
16
Colombia
16
Eastern Europe
16
Europe
16
Germany
16
India
16
Latin America
16
Mexico
16
North America
16
Pakistan
16
Paraguay
16
Philippines
16
Southern Europe
16
Taiwan
16
Thailand
16
The Netherlands
16
The United States
16
United Kingdom
16
Venezuela
16
Vietnam
16
Western Europe
16
demographic changes
16
world
16
Baltic countries
8
Bulgarie
8
Czech Republic
8
Finland
8