pre_text: entergy mississippi , inc . management's financial discussion and analysis results of operations net income 2008 compared to 2007 net income decreased $ 12.4 million primarily due to higher other operation and maintenance expenses , lower other income , and higher depreciation and amortization expenses , partially offset by higher net revenue . 2007 compared to 2006 net income increased $ 19.8 million primarily due to higher net revenue , lower other operation and maintenance expenses , higher other income , and lower interest expense , partially offset by higher depreciation and amortization expenses . net revenue 2008 compared to 2007 net revenue consists of operating revenues net of : 1 ) fuel , fuel-related expenses , and gas purchased for resale , 2 ) purchased power expenses , and 3 ) other regulatory charges . following is an analysis of the change in net revenue comparing 2008 to 2007 . amount ( in millions ) .
post_text: the attala costs variance is primarily due to an increase in the attala power plant costs that are recovered through the power management rider . the net income effect of this recovery in limited to a portion representing an allowed return on equity with the remainder offset by attala power plant costs in other operation and maintenance expenses , depreciation expenses , and taxes other than income taxes . the recovery of attala power plant costs is discussed further in "liquidity and capital resources - uses of capital" below . the rider revenue variance is the result of a storm damage rider that became effective in october 2007 . the establishment of this rider results in an increase in rider revenue and a corresponding increase in other operation and maintenance expense for the storm reserve with no effect on net income . the base revenue variance is primarily due to a formula rate plan increase effective july 2007 . the formula rate plan filing is discussed further in "state and local rate regulation" below . the reserve equalization variance is primarily due to changes in the entergy system generation mix compared to the same period in 2007. .
table: Amount (In Millions)
table: 2007 net revenue $486.9
table: Attala costs 9.9
table: Rider revenue 6.0
table: Base revenue 5.1
table: Reserve equalization (2.4)
table: Net wholesale revenue (4.0)
table: Other (2.7)
table: 2008 net revenue $498.8
question: Analyse this data from a financial earnings document. what is the percent change in net revenue between 2007 and 2008?