Table:
|  | Time-Based RSUs |  | PSUs and MPSUs |  | MSUs |  | Total |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
|  | Number of Shares | Weighted- Average Grant Date Fair Value Per Share | Number of Shares | Weighted- Average Grant Date Fair Value Per Share | Number of Shares | Weighted- Average Grant Date Fair Value Per Share | Number of Shares | Weighted- Average Grant Date Fair Value Per Share |
| Outstanding at January 1, 2017 | 366 | $51.35 | 2,284 | $43.24 | 1,620 | $23.57 | 4,270 | $36.47 |
| Granted | 81 | $94.25 | 585(1) | $62.72 | - | $- | 666 | $66.56 |
| Vested | (175) | $48.35 | (597) | $41.94 | - | $- | (772) | $43.39 |
| Forfeited | (14) | $61.8 | (6) | $49.82 | - | $- | (20) | $58.46 |
| Outstanding at December 31, 2017 | 258 | $66.3 | 2,266 | $48.59 | 1,620 | $23.57 | 4,144 | $39.91 |
| Granted | 133 | $114.36 | 630(1) | $85.06 | 600 | $68.48 | 1,363 | $80.62 |
| Vested | (136) | $60.23 | (717) | $41.08 | - | $- | (853) | $44.13 |
| Forfeited | (15) | $82.2 | (5) | $63.16 | (1) | $68.48 | (21) | $76.92 |
| Outstanding at December 31, 2018 | 240 | $95.38 | 2,174 | $61.61 | 2,219 | $35.69 | 4,633 | $50.94 |
| Granted | 52 | $142.32 | 512(1) | $99.88 | - | $- | 564 | $103.68 |
| Vested | (103) | $81.53 | (656) | $53.72 | (324) | $23.57 | (1,083) | $47.34 |
| Forfeited | (9) | $117.31 | (43) | $42.72 | (9) | $68.48 | (61) | $57.01 |
| Outstanding at December 31, 2019 | 180 | $115.45 | 1,987 | $74.50 | 1,886 | $37.63 | 4,053 | $59.16 |
Paragraphs:
RSUs
The Company’s RSUs include time-based RSUs, RSUs with performance conditions (“PSUs”), RSUs with market conditions (“MSUs”), and RSUs with both market and performance conditions (“MPSUs”). Vesting of awards with performance conditions or market conditions is subject to the achievement of pre-determined performance goals and the approval of such achievement by the Compensation Committee of the Board of Directors (the “Compensation Committee”). All awards include service conditions which require continued employment with the Company.
A summary of RSU activity is presented in the table below (in thousands, except per-share amounts):
(1) Amount reflects the number of awards that may ultimately be earned based on management’s probability assessment of the achievement of performance conditions at each reporting period.
The intrinsic value related to vested RSUs was $138.3 million, $90.0 million and $74.0 million for the years ended December 31, 2019, 2018 and 2017, respectively. As of December 31, 2019, the total intrinsic value of all outstanding RSUs was $679.5 million, based on the closing stock price of $178.02. As of December 31, 2019, unamortized compensation expense related to all outstanding RSUs was $100.1 million with a weighted-average remaining recognition period of approximately three years.
Cash proceeds from vested PSUs with a purchase price totaled $16.6 million and $10.6 million for the years ended December 31, 2019 and 2018, respectively. There were no proceeds for the year ended December 31, 2017.
Question:
What was the percentage change in Number of shares of PSUs and MPSUs Outstanding at December 31, 2017 to December 31, 2018?
Answer: (2174-2266)/2266 = -4.06