12 times in the years 1937, 1943, 1948, 1954, 1965, 1971, 1976, 1982, 1993, 1999, 2004 and 2010. The next one will be in 2021.
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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.
Since 1964, August 8 has fallen on a Sunday in the following years: 1965, 1971, 1976, 1982, 1993, 1999, 2004, 2010 This is a total of eight occasions.
It happens 56 times out of every 400 years.