How many leap years have there been since 1940 to 2016?

Including 1940 and 2016, there were 20 leap years. There were:

1940, 1944, 1948, 1952, 1956, 1960, 1964, 1968, 1972, 1976, 1980, 1984, 1988, 1992, 1996, 2000, 2004, 2008, 2012 and 2016.