Yes, you should as it could potentially decrease your taxable income and your tax. If you do not have the amount of interest paid in 2016, I would contact the lender or check your last 2016 statement for that amount.
You can follow the directions below to enter that student loan interest even if you didn't receive a Form 1098-E, Student Loan Interest form from your lender:
https://ttlc.intuit.com/replies/4801974
