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Datenquelle: BASE - Bielefeld Academic Search Engine
Bulgaria
21
China
France
Greece
21
Ireland
21
Italy
21
Japan
21
Poland
Spain
Germany
18
Hungary
18
Austria
15
Brazil
15
Canada
15
Romania
15
Singapore
15
Slovakia
15
Africa
12
Arab-Muslim world
12
Argentina
12
Asia
12
Bangladesh
12
Belgium
12
Bolivia
12
Colombia
12
Eastern Europe
12
Europe
12
India
12
Latin America
12
Mexico
12
North America
12
Pakistan
12
Paraguay
12
Philippines
12
Portugal
12
Russia
12
Southern Europe
12
Taiwan
12
Thailand
12
The Netherlands
12
The United States
12
United Kingdom
12
Venezuela
12
Vietnam
12
Western Europe
12
demographic changes
12
world
12
Denmark
9
Netherlands
9
Sweden
9