Part 2: Africa: economic transformation hinges on unlocking potential of cities
"Lack of urban planning leads to costly urban sprawl. In Accra, Ghana, for example, the population nearly doubled between 1991 and 2000, increasing from 1.3 million to 2.5 million inhabitants at an average annual growth rate of 7.2%. During the same period, the built up area of Accra tripled, increasing from 10 thousand hectares to 32 thousand hectares by an average annual rate of 12.8%."
Source: http://www.africaneconomicoutlook.org/sites/default/files/2016-05/AEO2016_Theme2016_Maps.pdf
By africaneconomicoutlook.org