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As of now (Sept 2016), 12 times in 77 years.
5 times: 1985, 1991, 1996, 2002 and 2013.
Any month starting on a Sunday will have a Friday the 13th as well as 5 Sundays... except February where that rule becomes a little wobbly and only happens about every 28 years... or something like that.
September 13 fell on a Friday four times between 1981 and 2012, in 1985, 1991, 1996 and 2002.