pre_text: corporate/other corporate/other includes treasury results , unallocated corporate expenses , offsets to certain line-item reclassifications reported in the business segments ( inter-segment eliminations ) , the results of discontinued operations and unallocated taxes . in millions of dollars 2008 2007 2006 .
post_text: 2008 vs . 2007 revenues , net of interest expense declined primarily due to the gain in 2007 on the sale of certain corporate-owned assets and higher inter-segment eliminations partially offset by improved treasury hedging activities . operating expenses declined primarily due to lower restructuring charges in the current year as well as reductions in incentive compensation and benefits expense . discontinued operations represent the sale of citigroup 2019s german retail banking operations and citicapital . see note 3 to the consolidated financial statements on page 136 for a more detailed discussion . 2007 vs . 2006 revenues , net of interest expense improved primarily due to improved treasury results and a gain on the sale of certain corporate-owned assets , partially offset by higher inter-segment eliminations . operating expenses increased primarily due to restructuring charges , increased staffing , technology and other unallocated expenses , partially offset by higher inter-segment eliminations . income tax benefits increased due to a higher pretax loss in 2007 , offset by a prior-year tax reserve release of $ 69 million relating to the resolution of the 2006 tax audits . discontinued operations represent the operations in the sale of the asset management business and the sale of the life insurance and annuities business . for 2006 , income from discontinued operations included gains and tax benefits relating to the final settlement of the life insurance and annuities and asset management sale transactions and a gain from the sale of the asset management business in poland , as well as a tax reserve release of $ 76 million relating to the resolution of the 2006 tax audits. .
table: <i>In millions of dollars</i> 2008 2007 2006
table: Net interest revenue $(1,288) $(461) $(345)
table: Non-interest revenue 438 (291) (599)
table: Revenues, net of interest expense $(850) $(752) $(944)
table: Operating expenses 526 1,830 202
table: Provisions for loan losses and for benefits and claims 1 (2) 4
table: Loss from continuing operations before taxes and minority interest $(1,377) $(2,580) $(1,150)
table: Income tax benefits (421) (922) (498)
table: Minority interest, net of taxes (2) 3 2
table: Loss from continuing operations $(954) $(1,661) $(654)
table: Income from discontinued operations 4,410 628 1,087
table: Net income (loss) $3,456 $(1,033) $433
question: Analyse this data from a financial earnings document. what was the percentage change in non-interest revenue from 2006 to 2007?