pre_text: A summary of option activity under all of the Company’s equity incentive plans at December 31, 2019 and changes during the period then ended is presented in the following table: There were no options granted for the year ended December 31, 2019 and 2018. The total intrinsic value of options exercised during year ended December 31, 2019, 2018 and 2017 were $215.5 million, $74.6 million, and $41.2 million, respectively.
table: Number of Options Outstanding (in thousands) Weighted- Average Exercise Price Per Share Weighted- Average Contractual Term (in Years) Aggregate Intrinsic Value (in thousands)
table: Outstanding at December 31, 2016 7,384 $10.59 5.3 $74,065
table: Granted 25 23.99
table: Exercised (1,722) 10.39
table: Canceled/Forfeited (401) 16.04
table: Outstanding at December 31, 2017 5,286 $10.30 4.2 $201,480
table: Granted - -
table: Exercised (1,138) 8.17
table: Canceled/Forfeited (17) 18.79
table: Outstanding at December 31, 2018 4,131 $10.86 3.3 $295,921
table: Granted - -
table: Exercised (1,742) 8.53
table: Canceled/Forfeited (132) 2.73
table: Outstanding at December 31, 2019 2,257 $13.13 2.5 $351,428
table: Vested and expected to vest as of December 31, 2019 2,259 $13.13 2.5 $351,362
table: Excercisable as of December 31, 2019 2,243 $13.10 2.5 $349,002
question: Analyse this data from a financial earnings document. What is the average total intrinsic value of options exercised during year ended December 31, 2017 to 2019?