Yes, the year-end amount indicated to be the FMV should have been included on line 6 of each of these Forms 8606.  You should amend the 2014 and 2015 Forms 8606 to correct the calculations and submit them with Form 1040X to report and pay the additional taxes due.  Since the amount on line 14 of each of these Forms 8606 carries forward to the following year's Form 8606, do each amendment in sequence.  Send each amendment separately.  Make sure that your 2016 Form 8606 then shows on line 2 the amount from line 14 of the corrected Form 8606.

Note that even though your annuity year-end statement substitutes for the Form 5498 that would otherwise be sent to you, the custodian sends an actual Form 5498 to the IRS each year.  You can obtain your Wage & Income transcript for each year if you want to make sure that you are using the same FMV as was reported to the IRS for each year:

https://www.irs.gov/individuals/get-transcript