{"pre_text": ["2022 higher 2017 sales volumes , incremental year-over-year cost savings associated with restructuring and productivity improvement initiatives , costs associated with various growth investments made in 2016 and changes in currency exchange rates , partially offset by incremental year-over-year costs associated with various product development and sales and marketing growth investments : 60 basis points year-over-year operating profit margin comparisons were unfavorably impacted by : 2022 the incremental year-over-year net dilutive effect of acquired businesses : 20 basis points 2016 compared to 2015 year-over-year price increases in the segment contributed 0.3% ( 0.3 % ) to sales growth during 2016 as compared to 2015 and are reflected as a component of the change in sales from existing businesses .", "sales from existing businesses in the segment 2019s transportation technologies businesses grew at a high-single digit rate during 2016 as compared to 2015 , due primarily to strong demand for dispenser , payment and point-of-sale systems , environmental compliance products as well as vehicle and fleet management products , partly offset by weaker year-over-year demand for compressed natural gas products .", "as expected , beginning in the second half of 2016 , the business began to experience reduced emv-related demand for indoor point-of-sale solutions , as customers had largely upgraded to products that support indoor emv requirements in the prior year in response to the indoor liability shift .", "however , demand increased on a year-over-year basis for dispensers and payment systems as customers in the united states continued to upgrade equipment driven primarily by the emv deadlines related to outdoor payment systems .", "geographically , sales from existing businesses continued to increase on a year-over-year basis in the united states and to a lesser extent in asia and western europe .", "sales from existing businesses in the segment 2019s automation & specialty components business declined at a low-single digit rate during 2016 as compared to 2015 .", "the businesses experienced sequential year-over-year improvement in demand during the second half of 2016 as compared to the first half of 2016 .", "during 2016 , year-over-year demand declined for engine retarder products due primarily to weakness in the north american heavy-truck market , partly offset by strong growth in china and europe .", "in addition , year-over-year demand declined in certain medical and defense related end markets which were partly offset by increased year-over-year demand for industrial automation products particularly in china .", "geographically , sales from existing businesses in the segment 2019s automation & specialty components businesses declined in north america , partly offset by growth in western europe and china .", "sales from existing businesses in the segment 2019s franchise distribution business grew at a mid-single digit rate during 2016 , as compared to 2015 , due primarily to continued net increases in franchisees as well as continued growth in demand for professional tool products and tool storage products , primarily in the united states .", "this growth was partly offset by year- over-year declines in wheel service equipment sales during 2016 .", "operating profit margins increased 70 basis points during 2016 as compared to 2015 .", "the following factors favorably impacted year-over-year operating profit margin comparisons : 2022 higher 2016 sales volumes , pricing improvements , incremental year-over-year cost savings associated with restructuring and productivity improvement initiatives and the incrementally favorable impact of the impairment of certain tradenames used in the segment in 2015 and 2016 , net of costs associated with various growth investments , product development and sales and marketing growth investments , higher year-over-year costs associated with restructuring actions and changes in currency exchange rates : 65 basis points 2022 the incremental net accretive effect in 2016 of acquired businesses : 5 basis points cost of sales and gross profit ."], "post_text": ["the year-over-year increase in cost of sales during 2017 as compared to 2016 is due primarily to the impact of higher year- over-year sales volumes and changes in currency exchange rates partly offset by incremental year-over-year cost savings ."], "table": [["( $ in millions )", "for the year ended december 31 2017", "for the year ended december 31 2016", "for the year ended december 31 2015"], ["sales", "$ 6656.0", "$ 6224.3", "$ 6178.8"], ["cost of sales", "-3357.5 ( 3357.5 )", "-3191.5 ( 3191.5 )", "-3178.8 ( 3178.8 )"], ["gross profit", "3298.5", "3032.8", "3000.0"], ["gross profit margin", "49.6% ( 49.6 % )", "48.7% ( 48.7 % )", "48.6% ( 48.6 % )"]], "table_ori": [["", "For the Year Ended December 31"], ["($ in millions)", "2017", "2016", "2015"], ["Sales", "$6,656.0", "$6,224.3", "$6,178.8"], ["Cost of sales", "(3,357.5)", "(3,191.5)", "(3,178.8)"], ["Gross profit", "3,298.5", "3,032.8", "3,000.0"], ["Gross profit margin", "49.6%", "48.7%", "48.6%"]]}

Question: what was the percentage change in sales from 2015 to 2016?
Evidence:
table_1: ( $ in millions ) the sales of for the year ended december 31 2017 is $ 6656.0 ; the sales of for the year ended december 31 2016 is $ 6224.3 ; the sales of for the year ended december 31 2015 is $ 6178.8 ;
Program: subtract(6224.3, 6178.8), divide(#0, 6178.8)
Answer:
str_answer: 1%
exe_answer: 0.00736