Source
United States Census Bureau - International Data Base (IDB), retrieved on 10 January 2012, including the minor demographic corrections from the June 2011 release notes). The CIA World Factbook is sometimes attributed as a source of these updated world population data; however, the CIA takes their demographic information from the IDB. The estimates are all for 1 July of each year mentioned.
Read more about this topic: List Of Countries By Past And Future Population
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