From Guardian website:
The world's population is growing at a startling rate. These new figures show the number of people in each country in the world
How many people live in each country in the world? The world's best source is the United Nations population division and this brand spanking new set of data shows estimates for the populations of every country in the world, going from 1950 all the way up to 2050.
Guardian - United Nations Population Statistics. No author.
Retrieved 04:48, May 22, 2013 (UTC).
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