{"pre_text": ["entergy arkansas , inc .", "management's financial discussion and analysis results of operations net income 2008 compared to 2007 net income decreased $ 92.0 million primarily due to higher other operation and maintenance expenses , higher depreciation and amortization expenses , and a higher effective income tax rate , partially offset by higher net revenue .", "the higher other operation and maintenance expenses resulted primarily from the write-off of approximately $ 70.8 million of costs as a result of the december 2008 arkansas court of appeals decision in entergy arkansas' base rate case .", "the base rate case is discussed in more detail in note 2 to the financial statements .", "2007 compared to 2006 net income decreased $ 34.0 million primarily due to higher other operation and maintenance expenses , higher depreciation and amortization expenses , and a higher effective income tax rate .", "the decrease was partially offset by higher net revenue .", "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 credits .", "following is an analysis of the change in net revenue comparing 2008 to 2007 .", "amount ( in millions ) ."], "post_text": ["the rider revenue variance is primarily due to an energy efficiency rider which became effective in november 2007 .", "the establishment of the rider results in an increase in rider revenue and a corresponding increase in other operation and maintenance expense with no effect on net income .", "also contributing to the variance was an increase in franchise tax rider revenue as a result of higher retail revenues .", "the corresponding increase is in taxes other than income taxes , resulting in no effect on net income .", "the purchased power capacity variance is primarily due to lower reserve equalization expenses .", "the volume/weather variance is primarily due to the effect of less favorable weather on residential and commercial sales during the billed and unbilled sales periods compared to 2007 and a 2.9% ( 2.9 % ) volume decrease in industrial sales , primarily in the wood industry and the small customer class .", "billed electricity usage decreased 333 gwh in all sectors .", "see \"critical accounting estimates\" below and note 1 to the financial statements for further discussion of the accounting for unbilled revenues. ."], "table": [["", "amount ( in millions )"], ["2007 net revenue", "$ 1110.6"], ["rider revenue", "13.6"], ["purchased power capacity", "4.8"], ["volume/weather", "-14.6 ( 14.6 )"], ["other", "3.5"], ["2008 net revenue", "$ 1117.9"]], "table_ori": [["", "Amount (In Millions)"], ["2007 net revenue", "$1,110.6"], ["Rider revenue", "13.6"], ["Purchased power capacity", "4.8"], ["Volume/weather", "(14.6)"], ["Other", "3.5"], ["2008 net revenue", "$1,117.9"]]}

Question: what percent of the net change in revenue between 2007 and 2008 was due to rider revenue?
Evidence:
table_1: the 2007 net revenue of amount ( in millions ) is $ 1110.6 ;
table_2: the rider revenue of amount ( in millions ) is 13.6 ;
table_6: the 2008 net revenue of amount ( in millions ) is $ 1117.9 ;
Program: subtract(1110.6, 1117.9), divide(13.6, #0)
Answer:
str_answer: 186%
exe_answer: -1.86301