{"pre_text": ["corporate/other corporate/other includes certain unallocated costs of global staff functions ( including finance , risk , human resources , legal and compliance ) , other corporate expenses and unallocated global operations and technology expenses and income taxes , as well as corporate treasury , certain north america legacy consumer loan portfolios , other legacy assets and discontinued operations ( for additional information on corporate/other , see 201ccitigroup segments 201d above ) .", "at december 31 , 2018 , corporate/other had $ 91 billion in assets , an increase of 17% ( 17 % ) from the prior year .", "in millions of dollars 2018 2017 2016 % (  % ) change 2018 vs .", "2017 % (  % ) change 2017 vs .", "2016 ."], "post_text": ["nm not meaningful 2018 vs .", "2017 net income was $ 107 million in 2018 , compared to a net loss of $ 19.7 billion in the prior year , primarily driven by the $ 19.8 billion one-time , non-cash charge recorded in the tax line in 2017 due to the impact of tax reform .", "results in 2018 included the one-time benefit of $ 94 million in the tax line , related to tax reform .", "for additional information , see 201csignificant accounting policies and significant estimates 2014income taxes 201d below .", "excluding the one-time impact of tax reform in 2018 and 2017 , net income decreased 92% ( 92 % ) , reflecting lower revenues , partially offset by lower expenses , lower cost of credit and tax benefits related to the reorganization of certain non-u.s .", "subsidiaries .", "the tax benefits were largely offset by the release of a foreign currency translation adjustment ( cta ) from aoci to earnings ( for additional information on the cta release , see note 19 to the consolidated financial statements ) .", "revenues decreased 33% ( 33 % ) , driven by the continued wind-down of legacy assets .", "expenses decreased 40% ( 40 % ) , primarily driven by the wind-down of legacy assets , lower infrastructure costs and lower legal expenses .", "provisions decreased $ 27 million to a net benefit of $ 202 million , primarily due to lower net credit losses , partially offset by a lower net loan loss reserve release .", "net credit losses declined 86% ( 86 % ) to $ 21 million , primarily reflecting the impact of ongoing divestiture activity and the continued wind-down of the north america mortgage portfolio .", "the net reserve release declined by $ 96 million to $ 221 million , and reflected the continued wind-down of the legacy north america mortgage portfolio and divestitures .", "2017 vs .", "2016 the net loss was $ 19.7 billion , compared to net income of $ 521 million in the prior year , primarily driven by the one-time impact of tax reform .", "excluding the one-time impact of tax reform , net income declined 69% ( 69 % ) to $ 168 million , reflecting lower revenues , partially offset by lower expenses and lower cost of credit .", "revenues declined 40% ( 40 % ) , primarily reflecting the continued wind-down of legacy assets and the absence of gains related to debt buybacks in 2016 .", "revenues included approximately $ 750 million in gains on asset sales in the first quarter of 2017 , which more than offset a roughly $ 300 million charge related to the exit of citi 2019s u.s .", "mortgage servicing operations in the quarter .", "expenses declined 24% ( 24 % ) , reflecting the wind-down of legacy assets and lower legal expenses , partially offset by approximately $ 100 million in episodic expenses primarily related to the exit of the u.s .", "mortgage servicing operations .", "also included in expenses is an approximately $ 255 million provision for remediation costs related to a card act matter in 2017 .", "provisions decreased $ 244 million to a net benefit of $ 175 million , primarily due to lower net credit losses and a lower provision for benefits and claims , partially offset by a lower net loan loss reserve release .", "net credit losses declined 66% ( 66 % ) , primarily reflecting the impact of ongoing divestiture activity and the continued wind-down of the north america mortgage portfolio .", "the decline in the provision for benefits and claims was primarily due to lower insurance activity .", "the net reserve release declined $ 147 million , and reflected the continued wind-down of the legacy north america mortgage portfolio and divestitures. ."], "table": [["in millions of dollars", "2018", "2017", "2016", "% (  % ) change2018 vs . 2017", "% (  % ) change2017 vs . 2016"], ["net interest revenue", "$ 2254", "$ 2000", "$ 3045", "13% ( 13 % )", "( 34 ) % (  % )"], ["non-interest revenue", "-171 ( 171 )", "1132", "2188", "nm", "-48 ( 48 )"], ["total revenues net of interest expense", "$ 2083", "$ 3132", "$ 5233", "( 33 ) % (  % )", "( 40 ) % (  % )"], ["total operating expenses", "$ 2272", "$ 3814", "$ 5042", "( 40 ) % (  % )", "( 24 ) % (  % )"], ["net credit losses", "$ 21", "$ 149", "$ 435", "( 86 ) % (  % )", "( 66 ) % (  % )"], ["credit reserve build ( release )", "-218 ( 218 )", "-317 ( 317 )", "-456 ( 456 )", "31", "30"], ["provision ( release ) for unfunded lending commitments", "-3 ( 3 )", "2014", "-8 ( 8 )", "2014", "100"], ["provision for benefits and claims", "-2 ( 2 )", "-7 ( 7 )", "98", "71", "nm"], ["provisions for credit losses and for benefits and claims", "$ -202 ( 202 )", "$ -175 ( 175 )", "$ 69", "-15 ( 15 )", "nm"], ["income ( loss ) from continuing operations before taxes", "$ 13", "$ -507 ( 507 )", "$ 122", "nm", "nm"], ["income taxes ( benefits )", "-113 ( 113 )", "19064", "-455 ( 455 )", "nm", "nm"], ["income ( loss ) from continuing operations", "$ 126", "$ -19571 ( 19571 )", "$ 577", "nm", "nm"], ["income ( loss ) from discontinued operations net of taxes", "-8 ( 8 )", "-111 ( 111 )", "-58 ( 58 )", "93", "-91 ( 91 )"], ["net income ( loss ) before attribution of noncontrolling interests", "$ 118", "$ -19682 ( 19682 )", "$ 519", "nm", "nm"], ["noncontrolling interests", "11", "-6 ( 6 )", "-2 ( 2 )", "nm", "nm"], ["net income ( loss )", "$ 107", "$ -19676 ( 19676 )", "$ 521", "nm", "nm"]], "table_ori": [["In millions of dollars", "2018", "2017", "2016", "% Change2018 vs. 2017", "% Change2017 vs. 2016"], ["Net interest revenue", "$2,254", "$2,000", "$3,045", "13%", "(34)%"], ["Non-interest revenue", "(171)", "1,132", "2,188", "NM", "(48)"], ["Total revenues, net of interest expense", "$2,083", "$3,132", "$5,233", "(33)%", "(40)%"], ["Total operating expenses", "$2,272", "$3,814", "$5,042", "(40)%", "(24)%"], ["Net credit losses", "$21", "$149", "$435", "(86)%", "(66)%"], ["Credit reserve build (release)", "(218)", "(317)", "(456)", "31", "30"], ["Provision (release) for unfunded lending commitments", "(3)", "—", "(8)", "—", "100"], ["Provision for benefits and claims", "(2)", "(7)", "98", "71", "NM"], ["Provisions for credit losses and for benefits and claims", "$(202)", "$(175)", "$69", "(15)", "NM"], ["Income (loss) from continuing operations before taxes", "$13", "$(507)", "$122", "NM", "NM"], ["Income taxes (benefits)", "(113)", "19,064", "(455)", "NM", "NM"], ["Income (loss) from continuing operations", "$126", "$(19,571)", "$577", "NM", "NM"], ["Income (loss) from discontinued operations, net of taxes", "(8)", "(111)", "(58)", "93", "(91)"], ["Net income (loss) before attribution of noncontrolling interests", "$118", "$(19,682)", "$519", "NM", "NM"], ["Noncontrolling interests", "11", "(6)", "(2)", "NM", "NM"], ["Net income (loss)", "$107", "$(19,676)", "$521", "NM", "NM"]]}

Question: what was the percentage change in total operating expenses between 2016 and 2018?
Evidence:
table_4: in millions of dollars the total operating expenses of 2018 is $ 2272 ; the total operating expenses of 2017 is $ 3814 ; the total operating expenses of 2016 is $ 5042 ; the total operating expenses of % ( % ) change2018 vs . 2017 is ( 40 ) % ( % ) ; the total operating expenses of % ( % ) change2017 vs . 2016 is ( 24 ) % ( % ) ;
Program: subtract(2272, 5042), divide(#0, 5042)
Answer:
str_answer: -55%
exe_answer: -0.54939