Financial report context:
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 .

Financial table:
in millions of dollars: net interest revenue; 2018: $ 2254; 2017: $ 2000; 2016: $ 3045; % (  % ) change2018 vs . 2017: 13% ( 13 % ); % (  % ) change2017 vs . 2016: ( 34 ) % (  % )
in millions of dollars: non-interest revenue; 2018: -171 ( 171 ); 2017: 1132; 2016: 2188; % (  % ) change2018 vs . 2017: nm; % (  % ) change2017 vs . 2016: -48 ( 48 )
in millions of dollars: total revenues net of interest expense; 2018: $ 2083; 2017: $ 3132; 2016: $ 5233; % (  % ) change2018 vs . 2017: ( 33 ) % (  % ); % (  % ) change2017 vs . 2016: ( 40 ) % (  % )
in millions of dollars: total operating expenses; 2018: $ 2272; 2017: $ 3814; 2016: $ 5042; % (  % ) change2018 vs . 2017: ( 40 ) % (  % ); % (  % ) change2017 vs . 2016: ( 24 ) % (  % )
in millions of dollars: net credit losses; 2018: $ 21; 2017: $ 149; 2016: $ 435; % (  % ) change2018 vs . 2017: ( 86 ) % (  % ); % (  % ) change2017 vs . 2016: ( 66 ) % (  % )
in millions of dollars: credit reserve build ( release ); 2018: -218 ( 218 ); 2017: -317 ( 317 ); 2016: -456 ( 456 ); % (  % ) change2018 vs . 2017: 31; % (  % ) change2017 vs . 2016: 30
in millions of dollars: provision ( release ) for unfunded lending commitments; 2018: -3 ( 3 ); 2017: 2014; 2016: -8 ( 8 ); % (  % ) change2018 vs . 2017: 2014; % (  % ) change2017 vs . 2016: 100
in millions of dollars: provision for benefits and claims; 2018: -2 ( 2 ); 2017: -7 ( 7 ); 2016: 98; % (  % ) change2018 vs . 2017: 71; % (  % ) change2017 vs . 2016: nm
in millions of dollars: provisions for credit losses and for benefits and claims; 2018: $ -202 ( 202 ); 2017: $ -175 ( 175 ); 2016: $ 69; % (  % ) change2018 vs . 2017: -15 ( 15 ); % (  % ) change2017 vs . 2016: nm
in millions of dollars: income ( loss ) from continuing operations before taxes; 2018: $ 13; 2017: $ -507 ( 507 ); 2016: $ 122; % (  % ) change2018 vs . 2017: nm; % (  % ) change2017 vs . 2016: nm
in millions of dollars: income taxes ( benefits ); 2018: -113 ( 113 ); 2017: 19064; 2016: -455 ( 455 ); % (  % ) change2018 vs . 2017: nm; % (  % ) change2017 vs . 2016: nm
in millions of dollars: income ( loss ) from continuing operations; 2018: $ 126; 2017: $ -19571 ( 19571 ); 2016: $ 577; % (  % ) change2018 vs . 2017: nm; % (  % ) change2017 vs . 2016: nm
in millions of dollars: income ( loss ) from discontinued operations net of taxes; 2018: -8 ( 8 ); 2017: -111 ( 111 ); 2016: -58 ( 58 ); % (  % ) change2018 vs . 2017: 93; % (  % ) change2017 vs . 2016: -91 ( 91 )
in millions of dollars: net income ( loss ) before attribution of noncontrolling interests; 2018: $ 118; 2017: $ -19682 ( 19682 ); 2016: $ 519; % (  % ) change2018 vs . 2017: nm; % (  % ) change2017 vs . 2016: nm
in millions of dollars: noncontrolling interests; 2018: 11; 2017: -6 ( 6 ); 2016: -2 ( 2 ); % (  % ) change2018 vs . 2017: nm; % (  % ) change2017 vs . 2016: nm
in millions of dollars: net income ( loss ); 2018: $ 107; 2017: $ -19676 ( 19676 ); 2016: $ 521; % (  % ) change2018 vs . 2017: nm; % (  % ) change2017 vs . 2016: nm

Additional report context:
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. .

Question: what was the percentage change in total operating expenses between 2016 and 2018?
Answer: -55%