human
humana inc. notes to consolidated financial statements 2014 (continued) the total intrinsic value of stock options exercised during 2007 was $133.9 million, compared with $133.7 million during 2006 and $57.8 million during 2005. cash received from stock option exercises for the years ended december 31, 2007, 2006, and 2005 totaled $62.7 million, $49.2 million, and $36.4 million, respectively. total compensation expense related to nonvested options not yet recognized was $23.6 million at december 31, 2007. we expect to recognize this compensation expense over a weighted average period of approximately 1.6 years. restricted stock awards restricted stock awards are granted with a fair value equal to the market price of our common stock on the date of grant. compensation expense is recorded straight-line over the vesting period, generally three years from the date of grant. the weighted average grant date fair value of our restricted stock awards was $63.59, $54.36, and $32.81 for the years ended december 31, 2007, 2006, and 2005, respectively. activity for our restricted stock awards was as follows for the year ended december 31, 2007: shares weighted average grant-date fair value.
|  | Shares | Weighted Average Grant-Date Fair Value |
| --------- | --------- | --------- |
| Nonvested restricted stock at December 31, 2006 | 1,107,455 | $45.86 |
| Granted | 852,353 | 63.59 |
| Vested | (51,206) | 56.93 |
| Forfeited | (63,624) | 49.65 |
| Nonvested restricted stock at December 31, 2007 | 1,844,978 | $53.61 |
the fair value of shares vested during the years ended december 31, 2007, 2006, and 2005 was $3.4 million, $2.3 million, and $0.6 million, respectively. total compensation expense related to nonvested restricted stock awards not yet recognized was $44.7 million at december 31, 2007. we expect to recognize this compensation expense over a weighted average period of approximately 1.4 years. there are no other contractual terms covering restricted stock awards once vested. .
Please compute the result.
what was the net change in the weighted average grant-date fair value from 2006 to 2007?
assistant
9.23
human
what is that change divided by the 2006 price?
assistant
0.16979