{"pre_text": ["corporate/other corporate/other includes global staff functions ( includes finance , risk , human resources , legal and compliance ) and other corporate expense , global operations and technology ( o&t ) , residual corporate treasury and corporate items .", "at december 31 , 2009 , this segment had approximately $ 230 billion of assets , consisting primarily of the company 2019s liquidity portfolio , including $ 110 billion of cash and cash equivalents. ."], "post_text": ["2009 vs .", "2008 revenues , net of interest expense declined , primarily due to the pretax loss on debt extinguishment related to the repayment of the $ 20 billion of tarp trust preferred securities and the pretax loss in connection with the exit from the loss-sharing agreement with the u.s .", "government .", "revenues also declined , due to the absence of the 2008 sale of citigroup global services limited recorded in o&t .", "this was partially offset by a pretax gain related to the exchange offers , revenues and higher intersegment eliminations .", "operating expenses increased , primarily due to intersegment eliminations and increases in compensation , partially offset by lower repositioning reserves .", "2008 vs .", "2007 revenues , net of interest expense increased primarily due to the gain in 2007 on the sale of certain corporate-owned assets and higher intersegment eliminations , partially offset by improved treasury hedging activities .", "operating expenses declined , primarily due to lower restructuring charges in 2008 as well as reductions in incentive compensation and benefits expense. ."], "table": [["in millions of dollars", "2009", "2008", "2007"], ["net interest revenue", "$ -1663 ( 1663 )", "$ -2680 ( 2680 )", "$ -2008 ( 2008 )"], ["non-interest revenue", "-8893 ( 8893 )", "422", "-302 ( 302 )"], ["total revenues net of interest expense", "$ -10556 ( 10556 )", "$ -2258 ( 2258 )", "$ -2310 ( 2310 )"], ["total operating expenses", "$ 1420", "$ 510", "$ 1813"], ["provisions for loan losses and for benefits and claims", "-1 ( 1 )", "1", "-3 ( 3 )"], ["( loss ) from continuing operations before taxes", "$ -11975 ( 11975 )", "$ -2769 ( 2769 )", "$ -4120 ( 4120 )"], ["income taxes ( benefits )", "-4369 ( 4369 )", "-587 ( 587 )", "-1446 ( 1446 )"], ["( loss ) from continuing operations", "$ -7606 ( 7606 )", "$ -2182 ( 2182 )", "$ -2674 ( 2674 )"], ["income ( loss ) from discontinued operations net of taxes", "-445 ( 445 )", "4002", "708"], ["net income ( loss ) before attribution of noncontrolling interests", "$ -8051 ( 8051 )", "$ 1820", "$ -1966 ( 1966 )"], ["net income attributable to noncontrolling interests", "2014", "2014", "2"], ["net income ( loss )", "$ -8051 ( 8051 )", "$ 1820", "$ -1968 ( 1968 )"]], "table_ori": [["In millions of dollars", "2009", "2008", "2007"], ["Net interest revenue", "$(1,663)", "$(2,680)", "$(2,008)"], ["Non-interest revenue", "(8,893)", "422", "(302)"], ["Total revenues, net of interest expense", "$(10,556)", "$(2,258)", "$(2,310)"], ["Total operating expenses", "$1,420", "$510", "$1,813"], ["Provisions for loan losses and for benefits and claims", "(1)", "1", "(3)"], ["(Loss) from continuing operations before taxes", "$(11,975)", "$(2,769)", "$(4,120)"], ["Income taxes (benefits)", "(4,369)", "(587)", "(1,446)"], ["(Loss) from continuing operations", "$(7,606)", "$(2,182)", "$(2,674)"], ["Income (loss) from discontinued operations, net of taxes", "(445)", "4,002", "708"], ["Net income (loss) before attribution of noncontrolling interests", "$(8,051)", "$1,820", "$(1,966)"], ["Net income attributable to noncontrolling interests", "—", "—", "2"], ["Net income (loss)", "$(8,051)", "$1,820", "$(1,968)"]]}

Question: what was the percentage change in total operating expenses between 2007 and 2008?
Evidence:
table_4: in millions of dollars the total operating expenses of 2009 is $ 1420 ; the total operating expenses of 2008 is $ 510 ; the total operating expenses of 2007 is $ 1813 ;
Program: subtract(510, 1813), divide(#0, 1813)
Answer:
str_answer: -72%
exe_answer: -0.7187