{"pre_text": ["entergy mississippi , inc .", "management 2019s financial discussion and analysis 2010 compared to 2009 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 ( credits ) .", "following is an analysis of the change in net revenue comparing 2010 to 2009 .", "amount ( in millions ) ."], "post_text": ["the volume/weather variance is primarily due to an increase of 1046 gwh , or 8% ( 8 % ) , in billed electricity usage in all sectors , primarily due to the effect of more favorable weather on the residential sector .", "gross operating revenues , fuel and purchased power expenses , and other regulatory charges ( credits ) gross operating revenues increased primarily due to an increase of $ 22 million in power management rider revenue as the result of higher rates , the volume/weather variance discussed above , and an increase in grand gulf rider revenue as a result of higher rates and increased usage , offset by a decrease of $ 23.5 million in fuel cost recovery revenues due to lower fuel rates .", "fuel and purchased power expenses decreased primarily due to a decrease in deferred fuel expense as a result of prior over-collections , offset by an increase in the average market price of purchased power coupled with increased net area demand .", "other regulatory charges increased primarily due to increased recovery of costs associated with the power management recovery rider .", "other income statement variances 2011 compared to 2010 other operation and maintenance expenses decreased primarily due to : a $ 5.4 million decrease in compensation and benefits costs primarily resulting from an increase in the accrual for incentive-based compensation in 2010 and a decrease in stock option expense ; and the sale of $ 4.9 million of surplus oil inventory .", "the decrease was partially offset by an increase of $ 3.9 million in legal expenses due to the deferral in 2010 of certain litigation expenses in accordance with regulatory treatment .", "taxes other than income taxes increased primarily due to an increase in ad valorem taxes due to a higher 2011 assessment as compared to 2010 , partially offset by higher capitalized property taxes as compared with prior year .", "depreciation and amortization expenses increased primarily due to an increase in plant in service .", "interest expense decreased primarily due to a revision caused by ferc 2019s acceptance of a change in the treatment of funds received from independent power producers for transmission interconnection projects. ."], "table": [["", "amount ( in millions )"], ["2009 net revenue", "$ 536.7"], ["volume/weather", "18.9"], ["other", "-0.3 ( 0.3 )"], ["2010 net revenue", "$ 555.3"]], "table_ori": [["", "Amount (In Millions)"], ["2009 net revenue", "$536.7"], ["Volume/weather", "18.9"], ["Other", "(0.3)"], ["2010 net revenue", "$555.3"]]}

Question: in 2010 what was the net change in net revenue in millions
Evidence:
table_2: the volume/weather of amount ( in millions ) is 18.9 ;
table_3: the other of amount ( in millions ) is -0.3 ( 0.3 ) ;
Program: add(18.9, 0.3)
Answer:
str_answer: 18.6
exe_answer: 19.2