How many leap years have occurred since 2004?

4, because there is one every four years and there was one in 2008. So there has been one in 1996, 2000, 2004, and 2008 have been leap years. In general, a year is a leap year if it is evenly divisible by 4. Most people also remember the exception which is a year is not a leap year if it ends in "00" (ie., the year is even divisable by 100). So years like 1972, 1980, and 1996 are leap years, but 1800 and 1900 are not. So why then is a 2000 a leap year? What many folks do not realize is that the 100 year exception itself has an exception. Years that are evenly divisable by 400 are leap years. So 2000 as well as 2400 will be leap years.