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. .

2009: net interest revenue: -1663
non-interest revenue: -8893
total revenues net of interest expense: -10556
total operating expenses: 1420
provisions for loan losses and for benefits and claims: -1
( loss ) from continuing operations before taxes: -11975
income taxes ( benefits ): -4369
( loss ) from continuing operations: -7606
income ( loss ) from discontinued operations net of taxes: -445
net income ( loss ) before attribution of noncontrolling interests: -8051
net income attributable to noncontrolling interests: 2014
net income ( loss ): -8051
2008: net interest revenue: -2680
non-interest revenue: 422
total revenues net of interest expense: -2258
total operating expenses: 510
provisions for loan losses and for benefits and claims: 1
( loss ) from continuing operations before taxes: -2769
income taxes ( benefits ): -587
( loss ) from continuing operations: -2182
income ( loss ) from discontinued operations net of taxes: 4002
net income ( loss ) before attribution of noncontrolling interests: 1820
net income attributable to noncontrolling interests: 2014
net income ( loss ): 1820
2007: net interest revenue: -2008
non-interest revenue: -302
total revenues net of interest expense: -2310
total operating expenses: 1813
provisions for loan losses and for benefits and claims: -3
( loss ) from continuing operations before taxes: -4120
income taxes ( benefits ): -1446
( loss ) from continuing operations: -2674
income ( loss ) from discontinued operations net of taxes: 708
net income ( loss ) before attribution of noncontrolling interests: -1966
net income attributable to noncontrolling interests: 2
net income ( loss ): -1968

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. .

Questions:
what were operating expenses in 2008?
what were they in 2007?
what is the net difference?
what is the difference divided by the 2007 value?

Answers:
510
1813
-1303
-72%