arconic and its subsidiaries file income tax returns in the u.s .federal jurisdiction and various states and foreign jurisdictions .with a few minor exceptions , arconic is no longer subject to income tax examinations by tax authorities for years prior to 2006 .all u.s .tax years prior to 2016 have been audited by the internal revenue service .various state and foreign jurisdiction tax authorities are in the process of examining arconic 2019s income tax returns for various tax years through 2015 .a reconciliation of the beginning and ending amount of unrecognized tax benefits ( excluding interest and penalties ) was as follows: .
[['december 31,', '2016', '2015', '2014'], ['balance at beginning of year', '$ 18', '$ 7', '$ 8'], ['additions for tax positions of the current year', '12', '-', '-'], ['additions for tax positions of prior years', '-', '14', '4'], ['reductions for tax positions of prior years', '-', '-2 ( 2 )', '-3 ( 3 )'], ['settlements with tax authorities', '-1 ( 1 )', '-', '-1 ( 1 )'], ['expiration of the statute of limitations', '-1 ( 1 )', '-1 ( 1 )', '-'], ['foreign currency translation', '-', '-', '-1 ( 1 )'], ['balance at end of year', '$ 28', '$ 18', '$ 7']]
for all periods presented , a portion of the balance at end of year pertains to state tax liabilities , which are presented before any offset for federal tax benefits .the effect of unrecognized tax benefits , if recorded , that would impact the annual effective tax rate for 2016 , 2015 , and 2014 would be approximately 6% ( 6 % ) , 7% ( 7 % ) , and 4% ( 4 % ) , respectively , of pretax book income .arconic does not anticipate that changes in its unrecognized tax benefits will have a material impact on the statement of consolidated operations during 2017 ( see tax in note l for a matter for which no reserve has been recognized ) .it is arconic 2019s policy to recognize interest and penalties related to income taxes as a component of the provision for income taxes on the accompanying statement of consolidated operations .in 2016 , 2015 , and 2014 , arconic did not recognize any interest or penalties .due to the expiration of the statute of limitations , settlements with tax authorities , and refunded overpayments , arconic recognized interest income of $ 1 in 2015 but did not recognize any interest income in 2016 or 2014 .as of december 31 , 2016 and 2015 , the amount accrued for the payment of interest and penalties was $ 2 and $ 1 , respectively .s .receivables sale of receivables programs arconic has an arrangement with three financial institutions to sell certain customer receivables without recourse on a revolving basis .the sale of such receivables is completed through the use of a bankruptcy remote special purpose entity , which is a consolidated subsidiary of arconic .this arrangement provides for minimum funding of $ 200 up to a maximum of $ 400 for receivables sold .on march 30 , 2012 , arconic initially sold $ 304 of customer receivables in exchange for $ 50 in cash and $ 254 of deferred purchase price under this arrangement .arconic has received additional net cash funding of $ 300 for receivables sold ( $ 1758 in draws and $ 1458 in repayments ) since the program 2019s inception , including $ 100 ( $ 500 in draws and $ 400 in repayments ) in 2016 .no draws or repayments occurred in 2015 .as of december 31 , 2016 and 2015 , the deferred purchase price receivable was $ 83 and $ 249 , respectively , which was included in other receivables on the accompanying consolidated balance sheet .the deferred purchase price receivable is reduced as collections of the underlying receivables occur ; however , as this is a revolving program , the sale of new receivables will result in an increase in the deferred purchase price receivable .the net change in the deferred purchase price receivable was reflected in the ( increase ) decrease in receivables line item on the accompanying statement of consolidated cash flows .this activity is reflected as an operating cash flow because the related customer receivables are the result of an operating activity with an insignificant , short-term interest rate risk. .

Question: what was the decrease observed in the deferred purchase price receivable during 2015 and 2016?
Answer: 66.67%
Explanation: it is the percentual variation between the deferred purchase price receivable in 2016 and 2015 , that is calculated by subtracting the final value of the initial value then dividing and turning it into a percentage .