2016 compared with 2015 net gains on investments of $ 57 million in 2016 decreased $ 52 million from 2015 due to lower net gains in 2016 .
net gains on investments in 2015 included a $ 40 million gain related to the bkca acquisition and a $ 35 million unrealized gain on a private equity investment .
interest and dividend income increased $ 14 million from 2015 primarily due to higher dividend income in 2016 .
2015 compared with 2014 net gains on investments of $ 109 million in 2015 decreased $ 45 million from 2014 due to lower net gains in 2015 .
net gains on investments in 2015 included a $ 40 million gain related to the bkca acquisition and a $ 35 million unrealized gain on a private equity investment .
net gains on investments in 2014 included the positive impact of the monetization of a nonstrategic , opportunistic private equity investment .
interest expense decreased $ 28 million from 2014 primarily due to repayments of long-term borrowings in the fourth quarter of 2014 .
income tax expense .

GAAP
As adjusted
(in millions)
2016
2015
2014
2016
2015
2014
Operating income<sup>(1)</sup>
$4,570
$4,664
$4,474
$4,674
$4,695
$4,563
Total nonoperating income (expense)<sup>(1),(2)</sup>
(108)
(69)
(49)
(108)
(70)
(56)
Income before income taxes<sup>(2)</sup>
$4,462
$4,595
$4,425
$4,566
$4,625
$4,507
Income tax expense
$1,290
$1,250
$1,131
$1,352
$1,312
$1,197
Effective tax rate
28.9%
27.2%
25.6%
29.6%
28.4%
26.6%

( 1 ) see non-gaap financial measures for further information on and reconciliation of as adjusted items .
( 2 ) net of net income ( loss ) attributable to nci .
the company 2019s tax rate is affected by tax rates in foreign jurisdictions and the relative amount of income earned in those jurisdictions , which the company expects to be fairly consistent in the near term .
the significant foreign jurisdictions that have lower statutory tax rates than the u.s .
federal statutory rate of 35% ( 35 % ) include the united kingdom , channel islands , ireland and canada .
u.s .
income taxes were not provided for certain undistributed foreign earnings intended to be indefinitely reinvested outside the united states .
2016 .
income tax expense ( gaap ) reflected : 2022 a net noncash benefit of $ 30 million , primarily associated with the revaluation of certain deferred income tax liabilities ; and 2022 a benefit from $ 65 million of nonrecurring items , including the resolution of certain outstanding tax matters .
the as adjusted effective tax rate of 29.6% ( 29.6 % ) for 2016 excluded the net noncash benefit of $ 30 million mentioned above , as it will not have a cash flow impact and to ensure comparability among periods presented .
2015 .
income tax expense ( gaap ) reflected : 2022 a net noncash benefit of $ 54 million , primarily associated with the revaluation of certain deferred income tax liabilities ; and 2022 a benefit from $ 75 million of nonrecurring items , primarily due to the realization of losses from changes in the company 2019s organizational tax structure and the resolution of certain outstanding tax matters .
the as adjusted effective tax rate of 28.4% ( 28.4 % ) for 2015 excluded the net noncash benefit of $ 54 million mentioned above , as it will not have a cash flow impact and to ensure comparability among periods presented .
2014 .
income tax expense ( gaap ) reflected : 2022 a $ 94 million tax benefit , primarily due to the resolution of certain outstanding tax matters related to the acquisition of bgi , including the previously mentioned $ 50 million tax benefit ( see executive summary for more information ) ; 2022 a $ 73 million net tax benefit related to several favorable nonrecurring items ; and 2022 a net noncash benefit of $ 9 million associated with the revaluation of deferred income tax liabilities .
the as adjusted effective tax rate of 26.6% ( 26.6 % ) for 2014 excluded the $ 9 million net noncash benefit as it will not have a cash flow impact and to ensure comparability among periods presented and the $ 50 million tax benefit mentioned above .
the $ 50 million general and administrative expense and $ 50 million tax benefit have been excluded from as adjusted results as there is no impact on blackrock 2019s book value .
balance sheet overview as adjusted balance sheet the following table presents a reconciliation of the consolidated statement of financial condition presented on a gaap basis to the consolidated statement of financial condition , excluding the impact of separate account assets and separate account collateral held under securities lending agreements ( directly related to lending separate account securities ) and separate account liabilities and separate account collateral liabilities under securities lending agreements and consolidated sponsored investment funds , including consolidated vies .
the company presents the as adjusted balance sheet as additional information to enable investors to exclude certain .

Question: Analyse this data from a financial earnings document. what is the percent change in effective tax rate from from 2015 to 2016?
Choices:
-0.017
0
0.017
4424.728
-0.007
Correct choice index: 2