what is the net increase in the balance of allowance for doubtful accounts receivable during 2015?
advance auto parts , inc . schedule ii - valuation and qualifying accounts ( in thousands ) allowance for doubtful accounts receivable : balance at beginning of period charges to expenses deductions balance at end of period january 3 , 2015 $ 13295 $ 17182 $ ( 14325 ) ( 1 ) $ 16152 january 2 , 2016 16152 22067 ( 12461 ) ( 1 ) 25758 december 31 , 2016 25758 24597 ( 21191 ) ( 1 ) 29164 ( 1 ) accounts written off during the period . these amounts did not impact the company 2019s statement of operations for any year presented . note : other valuation and qualifying accounts have not been reported in this schedule because they are either not applicable or because the information has been included elsewhere in this report. .

| Allowance for doubtful accounts receivable: | Balance atBeginningof Period | Charges toExpenses | Deductions |  | Balance atEnd ofPeriod |
| :--- | :--- | :--- | :--- | :--- | :--- |
| January 3, 2015 | $13,295 | $17,182 | $(14,325) | <sup>(1)</sup> | $16,152 |
| January 2, 2016 | 16,152 | 22,067 | (12,461) | <sup>(1)</sup> | 25,758 |
| December 31, 2016 | 25,758 | 24,597 | (21,191) | <sup>(1)</sup> | 29,164 |

advance auto parts , inc . schedule ii - valuation and qualifying accounts ( in thousands ) allowance for doubtful accounts receivable : balance at beginning of period charges to expenses deductions balance at end of period january 3 , 2015 $ 13295 $ 17182 $ ( 14325 ) ( 1 ) $ 16152 january 2 , 2016 16152 22067 ( 12461 ) ( 1 ) 25758 december 31 , 2016 25758 24597 ( 21191 ) ( 1 ) 29164 ( 1 ) accounts written off during the period . these amounts did not impact the company 2019s statement of operations for any year presented . note : other valuation and qualifying accounts have not been reported in this schedule because they are either not applicable or because the information has been included elsewhere in this report. .

increase_2015 = 16152 - 13295
answer = increase_2015