advance auto parts , inc . and subsidiaries notes to the consolidated financial statements 2013 ( continued ) december 29 , 2007 , december 30 , 2006 and december 31 , 2005 ( in thousands , except per share data ) 11 . stock repurchase program : during fiscal 2007 , the company's board of directors authorized a new stock repurchase program of up to $ 500000 of the company's common stock plus related expenses . the new program cancelled and replaced the remaining portion of the previous $ 300000 stock repurchase program . the program allows the company to repurchase its common stock on the open market or in privately negotiated transactions from time to time in accordance with the requirements of the securities and exchange commission . during fiscal 2007 , the company repurchased 8341 shares of common stock at an aggregate cost of $ 285869 , or an average price of $ 34.27 per share , of which 1330 shares of common stock were repurchased under the previous $ 300000 stock repurchase program . as of december 29 , 2007 , 77 shares have been repurchased at an aggregate cost of $ 2959 and remained unsettled . during fiscal 2007 , the company retired 6329 shares previously repurchased under the stock repurchase programs . at december 29 , 2007 , the company had $ 260567 remaining under the current stock repurchase program . subsequent to december 29 , 2007 , the company repurchased 4563 shares of common stock at an aggregate cost of $ 155350 , or an average price of $ 34.04 per share . during fiscal 2006 , the company retired 5117 shares of common stock which were previously repurchased under the company 2019s prior stock repurchase program . these shares were repurchased during fiscal 2006 and fiscal 2005 at an aggregate cost of $ 192339 , or an average price of $ 37.59 per share . 12 . income taxes : as a result of the adoption of fin 48 on december 31 , 2006 , the company recorded an increase of $ 2275 to the liability for unrecognized tax benefits and a corresponding decrease in its balance of retained earnings . the following table summarizes the activity related to our unrecognized tax benefits for the fiscal year ended december 29 , 2007: .

$ 16453: gross increases related to prior period tax positions: 1279
gross decreases related to prior period tax positions: -1853
gross increases related to current period tax positions: 5340
settlements: -539
expiration of statute of limitations: -271
balance at december 29 2007: 20409

as of december 29 , 2007 the entire amount of unrecognized tax benefits , if recognized , would reduce the company 2019s annual effective tax rate . with the adoption of fin 48 , the company provides for interest and penalties as a part of income tax expense . during fiscal 2007 , the company accrued potential penalties and interest of $ 709 and $ 1827 , respectively , related to these unrecognized tax benefits . as of december 29 , 2007 , the company has recorded a liability for potential penalties and interest of $ 1843 and $ 4421 , respectively . prior to the adoption of fin 48 , the company classified interest associated with tax contingencies in interest expense . the company has not provided for any penalties associated with tax contingencies unless considered probable of assessment . the company does not expect its unrecognized tax benefits to change significantly over the next 12 months . during the next 12 months , it is possible the company could conclude on $ 2000 to $ 3000 of the contingencies associated with unrecognized tax uncertainties due mainly to settlements and expiration of statute of limitations ( including tax benefits , interest and penalties ) . the majority of these resolutions would be achieved through the completion of current income tax examinations. .

Questions:
what is the balance of unrecognized tax benefits in 2007?
what about in 2006?
what is the net change?
what is the average stock price for repurchases shares in 2007?
what about the average for 2006 and 2005?
what is the net change?
what percentage change does this represent?

Answers:
20409
16453
3956
34.27
37.59
-3.32
-8.8%