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If you are looking for the years between 1991 and 2017, then you do not want to count 1991 nor 2017 in the answer. You answer would be 2017 - 1991 - 1 = 25 years.

If you are looking for the number of years from 1991 to 2017, then the answer would be 2017 - 1991 = 26 years.

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8y ago

What else can I help you with?