in summary , our cash flows for each period were as follows : years ended ( in millions ) dec 30 , dec 31 , dec 26 .
what was the percentage change in net cash provided by operating activities from 2015 to 2016?
operating activities cash provided by operating activities is net income adjusted for certain non-cash items and changes in assets and liabilities . for 2017 compared to 2016 , the $ 302 million increase in cash provided by operating activities was due to changes to working capital partially offset by adjustments for non-cash items and lower net income . tax reform did not have an impact on our 2017 cash provided by operating activities . the increase in cash provided by operating activities was driven by increased income before taxes and $ 1.0 billion receipts of customer deposits . these increases were partially offset by increased inventory and accounts receivable . income taxes paid , net of refunds , in 2017 compared to 2016 were $ 2.9 billion higher due to higher income before taxes , taxable gains on sales of asml , and taxes on the isecg divestiture . we expect approximately $ 2.0 billion of additional customer deposits in 2018 . for 2016 compared to 2015 , the $ 2.8 billion increase in cash provided by operating activities was due to adjustments for non-cash items and changes in working capital , partially offset by lower net income . the adjustments for non-cash items were higher in 2016 primarily due to restructuring and other charges and the change in deferred taxes , partially offset by lower depreciation . investing activities investing cash flows consist primarily of capital expenditures ; investment purchases , sales , maturities , and disposals ; and proceeds from divestitures and cash used for acquisitions . our capital expenditures were $ 11.8 billion in 2017 ( $ 9.6 billion in 2016 and $ 7.3 billion in 2015 ) . the decrease in cash used for investing activities in 2017 compared to 2016 was primarily due to higher net activity of available-for sale-investments in 2017 , proceeds from our divestiture of isecg in 2017 , and higher maturities and sales of trading assets in 2017 . this activity was partially offset by higher capital expenditures in 2017 . the increase in cash used for investing activities in 2016 compared to 2015 was primarily due to our completed acquisition of altera , net purchases of trading assets in 2016 compared to net sales of trading assets in 2015 , and higher capital expenditures in 2016 . this increase was partially offset by lower investments in non-marketable equity investments . financing activities financing cash flows consist primarily of repurchases of common stock , payment of dividends to stockholders , issuance and repayment of short-term and long-term debt , and proceeds from the sale of shares of common stock through employee equity incentive plans . the increase in cash used for financing activities in 2017 compared to 2016 was primarily due to net long-term debt activity , which was a use of cash in 2017 compared to a source of cash in 2016 . during 2017 , we repurchased $ 3.6 billion of common stock under our authorized common stock repurchase program , compared to $ 2.6 billion in 2016 . as of december 30 , 2017 , $ 13.2 billion remained available for repurchasing common stock under the existing repurchase authorization limit . we base our level of common stock repurchases on internal cash management decisions , and this level may fluctuate . proceeds from the sale of common stock through employee equity incentive plans totaled $ 770 million in 2017 compared to $ 1.1 billion in 2016 . our total dividend payments were $ 5.1 billion in 2017 compared to $ 4.9 billion in 2016 . we have paid a cash dividend in each of the past 101 quarters . in january 2018 , our board of directors approved an increase to our cash dividend to $ 1.20 per share on an annual basis . the board has declared a quarterly cash dividend of $ 0.30 per share of common stock for q1 2018 . the dividend is payable on march 1 , 2018 to stockholders of record on february 7 , 2018 . cash was used for financing activities in 2016 compared to cash provided by financing activities in 2015 , primarily due to fewer debt issuances and the repayment of debt in 2016 . this activity was partially offset by repayment of commercial paper in 2015 and fewer common stock repurchases in 2016 . md&a - results of operations consolidated results and analysis 37 .