Table:
|  | Number of Options Outstanding (in thousands) | Weighted- Average Exercise Price Per Share | Weighted- Average Contractual Term (in Years) | Aggregate Intrinsic Value (in thousands) |
| --- | --- | --- | --- | --- |
| Outstanding at December 31, 2016 | 7,384 | $10.59 | 5.3 | $74,065 |
| Granted | 25 | 23.99 |  |  |
| Exercised | (1,722) | 10.39 |  |  |
| Canceled/Forfeited | (401) | 16.04 |  |  |
| Outstanding at December 31, 2017 | 5,286 | $10.30 | 4.2 | $201,480 |
| Granted | - | - |  |  |
| Exercised | (1,138) | 8.17 |  |  |
| Canceled/Forfeited | (17) | 18.79 |  |  |
| Outstanding at December 31, 2018 | 4,131 | $10.86 | 3.3 | $295,921 |
| Granted | - | - |  |  |
| Exercised | (1,742) | 8.53 |  |  |
| Canceled/Forfeited | (132) | 2.73 |  |  |
| Outstanding at December 31, 2019 | 2,257 | $13.13 | 2.5 | $351,428 |
| Vested and expected to vest as of December 31, 2019 | 2,259 | $13.13 | 2.5 | $351,362 |
| Excercisable as of December 31, 2019 | 2,243 | $13.10 | 2.5 | $349,002 |
Paragraphs:
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.
Question:
What is the percentage change in the number of outstanding options between December 31, 2016 and 2017?
Answer: (5286- 7384)/ 7384  = -28.41