Please answer the given financial question based on the context.
Context: 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 ) .
||amount ( in millions )|
|2007 net revenue|$ 486.9|
|attala costs|9.9|
|rider revenue|6.0|
|base revenue|5.1|
|reserve equalization|-2.4 ( 2.4 )|
|net wholesale revenue|-4.0 ( 4.0 )|
|other|-2.7 ( 2.7 )|
|2008 net revenue|$ 498.8|
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. .
Question: what percent of the change in net revenue was due to rider revenue?


Answer: The answer is:0.5042