pre_text: entergy mississippi , inc . management 2019s financial discussion and analysis results of operations net income 2016 compared to 2015 net income increased $ 16.5 million primarily due to lower other operation and maintenance expenses , higher net revenues , and a lower effective income tax rate , partially offset by higher depreciation and amortization expenses . 2015 compared to 2014 net income increased $ 17.9 million primarily due to the write-off in 2014 of the regulatory assets associated with new nuclear generation development costs as a result of a joint stipulation entered into with the mississippi public utilities staff , subsequently approved by the mpsc , partially offset by higher depreciation and amortization expenses , higher taxes other than income taxes , higher other operation and maintenance expenses , and lower net revenue . see note 2 to the financial statements for discussion of the new nuclear generation development costs and the joint stipulation . net revenue 2016 compared to 2015 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 2016 to 2015 . amount ( in millions ) .
post_text: the retail electric price variance is primarily due to a $ 19.4 million net annual increase in revenues , as approved by the mpsc , effective with the first billing cycle of july 2016 , and an increase in revenues collected through the storm damage rider . see note 2 to the financial statements for more discussion on the formula rate plan and the storm damage rider . the volume/weather variance is primarily due to an increase of 153 gwh , or 1% ( 1 % ) , in billed electricity usage , including an increase in industrial usage , partially offset by the effect of less favorable weather on residential and commercial sales . the increase in industrial usage is primarily due to expansion projects in the pulp and paper industry , increased demand for existing customers , primarily in the metals industry , and new customers in the wood products industry. .
table: Amount (In Millions)
table: 2015 net revenue $696.3
table: Retail electric price 12.9
table: Volume/weather 4.7
table: Net wholesale revenue (2.4)
table: Reserve equalization (2.8)
table: Other (3.3)
table: 2016 net revenue $705.4
question: Analyse this data from a financial earnings document. for 2016 , what percentage of net revenue was due to the retail electric price adjustment?