n o t e s t o c o n s o l i d a t e d f i n a n c i a l s t a t e m e n t s ( continued ) ace limited and subsidiaries the following table shows changes in the company 2019s restricted stock for the years ended december 31 , 2008 , 2007 , and 2006 : number of restricted stock weighted average grant- date fair value .
what is the net change in the number of unvested restricted stocks in 2008?
under the provisions of fas 123r , the recognition of deferred compensation , a contra-equity account representing the amount of unrecognized restricted stock expense that is reduced as expense is recognized , at the date restricted stock is granted is no longer permitted . therefore , upon adoption of fas 123r , the amount of deferred compensation that had been reflected in unearned stock grant compensation was reclassified to additional paid-in capital in the company 2019s consolidated balance sheet . restricted stock units the company 2019s 2004 ltip also provides for grants of other awards , including restricted stock units . the company generally grants restricted stock units with a 4-year vesting period , based on a graded vesting schedule . each restricted stock unit repre- sents the company 2019s obligation to deliver to the holder one share of common shares upon vesting . during 2008 , the company awarded 223588 restricted stock units to officers of the company and its subsidiaries with a weighted-average grant date fair value of $ 59.93 . during 2007 , 108870 restricted stock units , with a weighted-average grant date fair value of $ 56.29 were awarded to officers of the company and its subsidiaries . during 2006 , 83370 restricted stock units , with a weighted-average grant date fair value of $ 56.36 were awarded to officers of the company and its subsidiaries . the company also grants restricted stock units with a 1-year vesting period to non-management directors . delivery of common shares on account of these restricted stock units to non-management directors is deferred until six months after the date of the non-management directors 2019 termination from the board . during 2008 , 2007 , and 2006 , 40362 restricted stock units , 29676 restricted stock units , and 23092 restricted stock units , respectively , were awarded to non-management direc- the espp gives participating employees the right to purchase common shares through payroll deductions during consecutive 201csubscription periods . 201d annual purchases by participants are limited to the number of whole shares that can be purchased by an amount equal to ten percent of the participant 2019s compensation or $ 25000 , whichever is less . the espp has two six-month subscription periods , the first of which runs between january 1 and june 30 and the second of which runs between july 1 and december 31 of each year . the amounts that have been collected from participants during a subscription period are used on the 201cexercise date 201d to purchase full shares of common shares . an exercise date is generally the last trading day of a sub- scription period . the number of shares purchased is equal to the total amount , as of the exercise date , that has been collected from the participants through payroll deductions for that subscription period , divided by the 201cpurchase price 201d , rounded down to the next full share . effective for and from the second subscription period of 2007 , the purchase price is 85 percent of the fair value of a common share on the exercise date . prior to the second subscription period of 2007 , the purchase price was calculated as the lower of ( i ) 85 percent of the fair value of a common share on the first day of the subscription period , or .