the goldman sachs group , inc .
and subsidiaries management 2019s discussion and analysis as of december 2017 , total staff increased 6% ( 6 % ) compared with december 2016 , reflecting investments in technology and marcus , and support of our regulatory efforts .
2016 versus 2015 .
operating expenses in the consolidated statements of earnings were $ 20.30 billion for 2016 , 19% ( 19 % ) lower than 2015 .
compensation and benefits expenses in the consolidated statements of earnings were $ 11.65 billion for 2016 , 8% ( 8 % ) lower than 2015 , reflecting a decrease in net revenues and the impact of expense savings initiatives .
the ratio of compensation and benefits to net revenues for 2016 was 38.1% ( 38.1 % ) compared with 37.5% ( 37.5 % ) for 2015 .
non-compensation expenses in the consolidated statements of earnings were $ 8.66 billion for 2016 , 30% ( 30 % ) lower than 2015 , primarily due to significantly lower net provisions for mortgage-related litigation and regulatory matters , which are included in other expenses .
in addition , market development expenses and professional fees were lower compared with 2015 , reflecting expense savings initiatives .
net provisions for litigation and regulatory proceedings for 2016 were $ 396 million compared with $ 4.01 billion for 2015 ( 2015 primarily related to net provisions for mortgage-related matters ) .
2016 included a $ 114 million charitable contribution to goldman sachs gives .
compensation was reduced to fund this charitable contribution to goldman sachs gives .
we ask our participating managing directors to make recommendations regarding potential charitable recipients for this contribution .
as of december 2016 , total staff decreased 7% ( 7 % ) compared with december 2015 , due to expense savings initiatives .
provision for taxes the effective income tax rate for 2017 was 61.5% ( 61.5 % ) , up from 28.2% ( 28.2 % ) for 2016 .
the increase compared with 2016 reflected the estimated impact of tax legislation , which was enacted on december 22 , 2017 and , among other things , lowers u.s .
corporate income tax rates as of january 1 , 2018 , implements a territorial tax system and imposes a repatriation tax on deemed repatriated earnings of foreign subsidiaries .
the estimated impact of tax legislation was an increase in income tax expense of $ 4.40 billion , of which $ 3.32 billion was due to the repatriation tax and $ 1.08 billion was due to the effects of the implementation of the territorial tax system and the remeasurement of u.s .
deferred tax assets at lower enacted corporate tax rates .
the impact of tax legislation may differ from this estimate , possibly materially , due to , among other things , ( i ) refinement of our calculations based on updated information , ( ii ) changes in interpretations and assumptions , ( iii ) guidance that may be issued and ( iv ) actions we may take as a result of tax legislation .
excluding the estimated impact of tax legislation , the effective income tax rate for 2017 was 22.0% ( 22.0 % ) , down from 28.2% ( 28.2 % ) for 2016 .
this decrease was primarily due to tax benefits on the settlement of employee share-based awards in accordance with asu no .
2016-09 .
the impact of these settlements in 2017 was a reduction to our provision for taxes of $ 719 million and a reduction in our effective income tax rate of 6.4 percentage points .
see note 3 to the consolidated financial statements for further information about this asu .
the effective income tax rate , excluding the estimated impact of tax legislation , is a non-gaap measure and may not be comparable to similar non-gaap measures used by other companies .
we believe that presenting our effective income tax rate , excluding the estimated impact of tax legislation is meaningful , as excluding this item increases the comparability of period-to-period results .
the table below presents the calculation of the effective income tax rate , excluding the estimated impact of tax legislation. .

Year Ended December 2017
<i>$ in millions</i>
Pre-tax earnings
Provision for taxes
Effective income tax rate
As reported
$11,132
$6,846
61.5%
Estimated impact of Tax Legislation
–
4,400
–
Excluding the estimated impact of TaxLegislation
$11,132
$2,446
22.0%

excluding the estimated impact of tax legislation $ 11132 $ 2446 22.0% ( 22.0 % ) the effective income tax rate for 2016 was 28.2% ( 28.2 % ) , down from 30.7% ( 30.7 % ) for 2015 .
the decline compared with 2015 was primarily due to the impact of non-deductible provisions for mortgage-related litigation and regulatory matters in 2015 , partially offset by the impact of changes in tax law on deferred tax assets , the mix of earnings and an increase related to higher enacted tax rates impacting certain of our u.k .
subsidiaries in 2016 .
effective january 1 , 2018 , tax legislation reduced the u.s .
corporate tax rate to 21 percent , eliminated tax deductions for certain expenses and enacted two new taxes , base erosion and anti-abuse tax ( beat ) and global intangible low taxed income ( gilti ) .
beat is an alternative minimum tax that applies to banks that pay more than 2 percent of total deductible expenses to certain foreign subsidiaries .
gilti is a 10.5 percent tax , before allowable credits for foreign taxes paid , on the annual earnings and profits of certain foreign subsidiaries .
based on our current understanding of these rules , the impact of beat and gilti is not expected to be material to our effective income tax rate .
goldman sachs 2017 form 10-k 55 .

Question: Analyse this data from a financial earnings document. what was the change in percentage points in the effective income tax rate for 2017 from 2016?
Choices:
6.2
0.2
-21.9
0
-6.2
Correct choice index: 0