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Ravenstein’s ‘laws’ of Migration
www.mrtredinnick.com1990 2000 2010 2020. 64.7 59.7 2030. 2040. percentage Of world population living in cities 36.0 32.9 29.1 39.1 1950 1960 1970 1980 SOURCE united Nations. DepMtment of ard Socia I Affairs. Populatk'n Division 'Projected