The 2005, 2010, and 2015 numbers are projections based on data from 2000: http://sedac.ciesin.columbia.edu/data/set/gpw-v3-population-count-future-estimates ht

The 2005, 2010, and 2015 numbers are projections based on data from 2000: http://sedac.ciesin.columbia.edu/data/set/gpw-v3-population-count-future-estimates http://sedac.ciesin.columbia.edu/data/set/gpw-v3-population-... I should add a note about the Chongqing spike being incorrect to the about.