during fiscal 2013 , we entered into an asr with a financial institution to repurchase an aggregate of $ 125 million of our common stock . in exchange for an up-front payment of $ 125 million , the financial institution committed to deliver a number of shares during the asr 2019s purchase period , which ended on march 30 , 2013 . the total number of shares delivered under this asr was 2.5 million at an average price of $ 49.13 per share . during fiscal 2013 , in addition to shares repurchased under the asr , we repurchased and retired 1.1 million shares of our common stock at a cost of $ 50.3 million , or an average of $ 44.55 per share , including commissions . note 10 2014share-based awards and options non-qualified stock options and restricted stock have been granted to officers , key employees and directors under the global payments inc . 2000 long-term incentive plan , as amended and restated ( the 201c2000 plan 201d ) , the global payments inc . amended and restated 2005 incentive plan ( the 201c2005 plan 201d ) , the amended and restated 2000 non-employee director stock option plan ( the 201cdirector stock option plan 201d ) , and the global payments inc . 2011 incentive plan ( the 201c2011 plan 201d ) ( collectively , the 201cplans 201d ) . there were no further grants made under the 2000 plan after the 2005 plan was effective , and the director stock option plan expired by its terms on february 1 , 2011 . there will be no future grants under the 2000 plan , the 2005 plan or the director stock option the 2011 plan permits grants of equity to employees , officers , directors and consultants . a total of 7.0 million shares of our common stock was reserved and made available for issuance pursuant to awards granted under the 2011 plan . the following table summarizes share-based compensation expense and the related income tax benefit recognized for stock options , restricted stock , performance units , tsr units , and shares issued under our employee stock purchase plan ( each as described below ) . 2015 2014 2013 ( in millions ) .

2015: share-based compensation expense: 21.1
income tax benefit: -6.9
2014 ( in millions ): share-based compensation expense: 29.8
income tax benefit: -7.1
2013: share-based compensation expense: 18.4
income tax benefit: -5.6

we grant various share-based awards pursuant to the plans under what we refer to as our 201clong-term incentive plan . 201d the awards are held in escrow and released upon the grantee 2019s satisfaction of conditions of the award certificate . restricted stock and restricted stock units we grant restricted stock and restricted stock units . restricted stock awards vest over a period of time , provided , however , that if the grantee is not employed by us on the vesting date , the shares are forfeited . restricted shares cannot be sold or transferred until they have vested . restricted stock granted before fiscal 2015 vests in equal installments on each of the first four anniversaries of the grant date . restricted stock granted during fiscal 2015 will either vest in equal installments on each of the first three anniversaries of the grant date or cliff vest at the end of a three-year service period . the grant date fair value of restricted stock , which is based on the quoted market value of our common stock at the closing of the award date , is recognized as share-based compensation expense on a straight-line basis over the vesting period . performance units certain of our executives have been granted up to three types of performance units under our long-term incentive plan . performance units are performance-based restricted stock units that , after a performance period , convert into common shares , which may be restricted . the number of shares is dependent upon the achievement of certain performance measures during the performance period . the target number of performance units and any market-based performance measures ( 201cat threshold , 201d 201ctarget , 201d and 201cmaximum 201d ) are set by the compensation committee of our board of directors . performance units are converted only after the compensation committee certifies performance based on pre-established goals . 80 2013 global payments inc . | 2015 form 10-k annual report .

Questions:
what is the share-based compensation expense in 2015?
and in 2014?
so what was the difference between these two years?
and the value for 2014 again?
so what was the growth rate during this time?

Answers:
21.1
29.8
-8.7
29.8
-29.2%