09.10.2009 - World Muslim population is 1.57bln
From UPI: The world's Muslim population stands at 1.57 billion, or 23 percent of the total population of 6.8 billion, a study released in Washington indicated. The Pew Research Center Forum on Religion & Public Life said its study was based on demographic data from 232 countries and territories. The study found Muslims inhabit all five continents but more than 60 percent of them are in Asia, and another 20 percent are in the Middle East and North Africa....................Full Article: Source
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