It is 17 years if you mean the difference of the year 1997 and 2014.
What? That doesn't make sence! Any way if you mean 1997 to 2014 how many years.
The difference between the years 2014 and 1997 is 17 years, calculated by subtracting 1997 from 2014. This simple subtraction gives us the total number of years between the two dates.
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