Financial report context:
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 .

Financial table:
in millions of dollars: net interest revenue; 2008: $ -1288 ( 1288 ); 2007: $ -461 ( 461 ); 2006: $ -345 ( 345 )
in millions of dollars: non-interest revenue; 2008: 438; 2007: -291 ( 291 ); 2006: -599 ( 599 )
in millions of dollars: revenues net of interest expense; 2008: $ -850 ( 850 ); 2007: $ -752 ( 752 ); 2006: $ -944 ( 944 )
in millions of dollars: operating expenses; 2008: 526; 2007: 1830; 2006: 202
in millions of dollars: provisions for loan losses and for benefits and claims; 2008: 1; 2007: -2 ( 2 ); 2006: 4
in millions of dollars: loss from continuing operations before taxes and minority interest; 2008: $ -1377 ( 1377 ); 2007: $ -2580 ( 2580 ); 2006: $ -1150 ( 1150 )
in millions of dollars: income tax benefits; 2008: -421 ( 421 ); 2007: -922 ( 922 ); 2006: -498 ( 498 )
in millions of dollars: minority interest net of taxes; 2008: -2 ( 2 ); 2007: 3; 2006: 2
in millions of dollars: loss from continuing operations; 2008: $ -954 ( 954 ); 2007: $ -1661 ( 1661 ); 2006: $ -654 ( 654 )
in millions of dollars: income from discontinued operations; 2008: 4410; 2007: 628; 2006: 1087
in millions of dollars: net income ( loss ); 2008: $ 3456; 2007: $ -1033 ( 1033 ); 2006: $ 433

Additional report context:
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. .

Question: what was the percentage change in non-interest revenue from 2006 to 2007?
Answer: 51%