alcoa and its subsidiaries file income tax returns in the u.s .
federal jurisdiction and various states and foreign jurisdictions .
with a few minor exceptions , alcoa is no longer subject to income tax examinations by tax authorities for years prior to 2006 .
all u.s .
tax years prior to 2015 have been audited by the internal revenue service .
various state and foreign jurisdiction tax authorities are in the process of examining alcoa 2019s income tax returns for various tax years through 2014 .
a reconciliation of the beginning and ending amount of unrecognized tax benefits ( excluding interest and penalties ) was as follows: .

December 31,
2015
2014
2013
Balance at beginning of year
$35
$63
$66
Additions for tax positions of the current year
2
2
2
Additions for tax positions of prior years
15
5
11
Reductions for tax positions of prior years
(2)
(4)
(2)
Settlements with tax authorities
(2)
(29)
(8)
Expiration of the statute of limitations
(1)
-
(2)
Foreign currency translation
(4)
(2)
(4)
Balance at end of year
$43
$35
$63

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 2015 , 2014 , and 2013 would be approximately 12% ( 12 % ) , 4% ( 4 % ) , and ( 1 ) % (  % ) , respectively , of pretax book income ( loss ) .
alcoa does not anticipate that changes in its unrecognized tax benefits will have a material impact on the statement of consolidated operations during 2016 ( see other matters in note n for a matter for which no reserve has been recognized ) .
it is alcoa 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 2015 , 2014 , and 2013 , alcoa recognized $ 8 , $ 1 , and $ 2 , respectively , in interest and penalties .
due to the expiration of the statute of limitations , settlements with tax authorities , and refunded overpayments , alcoa also recognized interest income of $ 2 , $ 5 , and $ 12 in 2015 , 2014 , and 2013 , respectively .
as of december 31 , 2015 and 2014 , the amount accrued for the payment of interest and penalties was $ 9 .
u .
receivables sale of receivables programs alcoa 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 alcoa .
this arrangement provides for minimum funding of $ 200 up to a maximum of $ 500 for receivables sold .
on march 30 , 2012 , alcoa initially sold $ 304 of customer receivables in exchange for $ 50 in cash and $ 254 of deferred purchase price under this arrangement .
alcoa has received additional net cash funding of $ 200 for receivables sold ( $ 1258 in draws and $ 1058 in repayments ) since the program 2019s inception ( no draws or repayments occurred in 2015 ) , including $ 40 ( $ 710 in draws and $ 670 in repayments ) in 2014 .
as of december 31 , 2015 and 2014 , the deferred purchase price receivable was $ 249 and $ 356 , 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 decrease ( increase ) 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: Analyse this data from a financial earnings document. what was the increase in the settlements with tax authorities as a percent of the tax liabilities observed during 2013 and 2014?
Choices:
0.30736
-0.7697
0.07879
0.36
0.05294
Correct choice index: 2