13 years
There are 13 leap years during that period:2000200420082012201620202024202820322036204020442048
There have been eight (8) leap years from 1978 to 2010.(The next one is 2012):19801984198819921996200020042008
Between those years there are four.
There 400 years between them.
2019 - 1999 = 20 years.
If you're not including 396 or 1999 but only the years between them, then there are 1999-396-1 or 1602 years
There were 1603 years between 396 CE (AD) and 1999 CE (AD).
1999: there was no year 0.
Including both of those years, then it was five times. In 1982, 1993, 1999, 2004 and 2010.
1999
11 years
Since 1978
63,080,188,130,000 (rounded)
4 years are between because in those 4 yars they practice and take junior matches and grand pixes etc.
Pope John Paul was elected on October 16th 1978 and so in 2004 he would have been between 25 and 26 years on the Throne of Peter.
Dan Marino played college ball at the University of Pittsburgh between 1979-1982 and played professional football for the Miami Dolphins between 1983-1999.