PARIS (Reuters)- Falling birth rates will slow the world's Muslim population growth over the next two decades, reducing it on average from 2.2 percent a year in 1990-2010 to 1.5 percent a year from now until 2030, a new study says.

Muslims will number 2.2 billion by 2030 compared to 1.6 billion in 2010, making up 26.4 percent of the world population compared to 23.4 percent now, according to estimates by the Pew Forum on Religion and Public Life.

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