human
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. .
| 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) |
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. .
Please answer the following question with expressions if necessary.
what is the difference divided by the 2007 value?
assistant
subtract(510, 1813), divide(#0, 1813)