borrowings reflect net proceeds received from the issuance of senior notes in june 2015 .see liquidity and capital resources below for additional information .in november 2015 , we repaid our $ 1 billion 0.90% ( 0.90 % ) senior notes upon maturity .in october 2015 , we announced an adjustment to our quarterly dividend .see capital requirements below for additional information .additions to property , plant and equipment are our most significant use of cash and cash equivalents .the following table shows capital expenditures related to continuing operations by segment and reconciles to additions to property , plant and equipment as presented in the consolidated statements of cash flows for 2015 , 2014 and 2013: .
[['( in millions )', 'year ended december 31 , 2015', 'year ended december 31 , 2014', 'year ended december 31 , 2013'], ['north america e&p', '$ 2553', '$ 4698', '$ 3649'], ['international e&p', '368', '534', '456'], ['oil sands mining ( a )', '-10 ( 10 )', '212', '286'], ['corporate', '25', '51', '58'], ['total capital expenditures', '2936', '5495', '4449'], ['change in capital expenditure accrual', '540', '-335 ( 335 )', '-6 ( 6 )'], ['additions to property plant and equipment', '$ 3476', '$ 5160', '$ 4443']]
( a ) reflects reimbursements earned from the governments of canada and alberta related to funds previously expended for quest ccs capital equipment .quest ccs was successfully completed and commissioned in the fourth quarter of 2015 .during 2014 , we acquired 29 million shares at a cost of $ 1 billion and in 2013 acquired 14 million shares at a cost of $ 500 million .there were no share repurchases in 2015 .see item 8 .financial statements and supplementary data 2013 note 23 to the consolidated financial statements for discussion of purchases of common stock .liquidity and capital resources on june 10 , 2015 , we issued $ 2 billion aggregate principal amount of unsecured senior notes which consist of the following series : 2022 $ 600 million of 2.70% ( 2.70 % ) senior notes due june 1 , 2020 2022 $ 900 million of 3.85% ( 3.85 % ) senior notes due june 1 , 2025 2022 $ 500 million of 5.20% ( 5.20 % ) senior notes due june 1 , 2045 interest on each series of senior notes is payable semi-annually beginning december 1 , 2015 .we used the aggregate net proceeds to repay our $ 1 billion 0.90% ( 0.90 % ) senior notes on november 2 , 2015 , and the remainder for general corporate purposes .in may 2015 , we amended our $ 2.5 billion credit facility to increase the facility size by $ 500 million to a total of $ 3.0 billion and extend the maturity date by an additional year such that the credit facility now matures in may 2020 .the amendment additionally provides us the ability to request two one-year extensions to the maturity date and an option to increase the commitment amount by up to an additional $ 500 million , subject to the consent of any increasing lenders .the sub-facilities for swing-line loans and letters of credit remain unchanged allowing up to an aggregate amount of $ 100 million and $ 500 million , respectively .fees on the unused commitment of each lender , as well as the borrowing options under the credit facility , remain unchanged .our main sources of liquidity are cash and cash equivalents , internally generated cash flow from operations , capital market transactions , our committed revolving credit facility and sales of non-core assets .our working capital requirements are supported by these sources and we may issue either commercial paper backed by our $ 3.0 billion revolving credit facility or draw on our $ 3.0 billion revolving credit facility to meet short-term cash requirements or issue debt or equity securities through the shelf registration statement discussed below as part of our longer-term liquidity and capital management .because of the alternatives available to us as discussed above , we believe that our short-term and long-term liquidity is adequate to fund not only our current operations , but also our near-term and long-term funding requirements including our capital spending programs , dividend payments , defined benefit plan contributions , repayment of debt maturities and other amounts that may ultimately be paid in connection with contingencies .general economic conditions , commodity prices , and financial , business and other factors could affect our operations and our ability to access the capital markets .a downgrade in our credit ratings could negatively impact our cost of capital and our ability to access the capital markets , increase the interest rate and fees we pay on our unsecured revolving credit facility , restrict our access to the commercial paper market , or require us to post letters of credit or other forms of collateral for certain .

Question: by how much did additions to property plant and equipment decrease from 2013 to 2015?
Answer: -21.8%