There are many reasons to move to the town or city. Some people may no-longer be able to subsist in a rural area, or maybe the opportunities of the city are an incentive to move. Some of the forecasted increase in urban populations between 2002 and 2015 is due to birth rates exceeding death rates within a city.
A total increase of 888 million people living in urban areas is predicted in 186 territories. In the remaining 14 territories, no change or a fall is expected, totalling 6.5 million.
By 2015, an extra 22% of the 2002 population of Indonesia is expected to live in urban areas. An extra 25% of people living in the Philippines will be urban dwellers by this time.