There are 20 years between 1999 and 2019. To calculate this, subtract 1999 from 2019 (2019 - 1999 = 20). This is because you are counting from the starting year (1999) up to and including the ending year (2019), which gives you a total of 20 years.
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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.
it is 36 years between 1968 and 2004
There are 23 years between 1988 and 2011.