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: .

Table:
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: considering the years 2014-2015 , what was the increase in the additions for tax positions of prior years , in dollars?
Answer: 10
Calculation: subtract(14, 4)