(measure: percent; source: The Cline Center for Democracy)
USA: Non religious people as percent of the population
For that indicator, The Cline Center for Democracy provides data for the USA from 1960 to 2013. The average value for the USA during that period was 9.1 percent with a minumum of 3.3 percent in 1960 and a maximum of 18.7 percent in 2013.
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