2014 vs . 2013 sales increased 9% ( 9 % ) , as higher volumes of 9% ( 9 % ) and favorable currency of 1% ( 1 % ) were partially offset by lower pricing of 1% ( 1 % ) . electronics sales increased 8% ( 8 % ) , as higher delivery systems equipment sales and materials volumes of 8% ( 8 % ) and favorable currency of 1% ( 1 % ) were partially offset by lower pricing of 1% ( 1 % ) . performance materials sales increased 10% ( 10 % ) , as higher volumes of 11% ( 11 % ) were partially offset by lower pricing of 1% ( 1 % ) . the higher volumes were across all product lines and major regions . the lower pricing was primarily due to unfavorable mix impacts . operating income of $ 425.3 increased 32% ( 32 % ) , or $ 104.0 , primarily from higher volumes of $ 93 , lower operating costs of $ 31 , and favorable currency impacts of $ 5 , partially offset by unfavorable price and mix impacts of $ 26 . operating margin of 17.4% ( 17.4 % ) increased 310 bp , primarily due to improved loading and leverage from the higher volumes and improved cost performance , partially offset by the unfavorable pricing impacts . 2013 vs . 2012 sales decreased 3% ( 3 % ) , as lower volumes of 4% ( 4 % ) and lower pricing of 1% ( 1 % ) were partially offset by acquisitions of 2% ( 2 % ) . electronics sales decreased 8% ( 8 % ) , as weaker materials volumes and equipment sales were partially offset by the acquisition of da nanomaterials . performance materials sales increased 2% ( 2 % ) , as higher volumes of 4% ( 4 % ) were partially offset by lower pricing of 2% ( 2 % ) . the increase in volumes was primarily due to strength in the automobile and u.s . housing markets partially offset by weaker volumes to certain construction markets and marine coatings . the lower pricing was primarily due to unfavorable mix impacts . operating income of $ 321.3 decreased 25% ( 25 % ) , or $ 104.3 , and operating margin of 14.3% ( 14.3 % ) decreased 400 bp , as 2012 included a gain on the previously held equity interest in da nanomaterials of $ 85.9 . on a non-gaap basis , operating income of $ 321.3 decreased 5% ( 5 % ) , or $ 18.4 , primarily from unfavorable price and mix impacts of $ 15 , lower volumes of $ 9 , and higher operating costs of $ 4 partially offset by higher acquisitions of $ 6 and favorable currency of $ 4 . operating margin decreased 30 bp , primarily due to lower volumes and unfavorable price mix . equipment and energy .
what was the operating margin for 2012?
2014 vs . 2013 sales of $ 450.4 were relatively flat as higher liquefied natural gas ( lng ) project activity was offset by lower air separation ( asu ) project activity . operating income of $ 88.2 increased from the higher lng project activity . the sales backlog for the equipment business at 30 september 2014 was $ 520 , compared to $ 402 at 30 september 2013 . the increase was primarily due to new lng orders as global project development activity remains high . it is expected that approximately $ 320 of the backlog will be completed during 2015 . 2013 vs . 2012 sales of $ 451.1 increased primarily from higher lng project activity . operating income of $ 65.5 increased from the higher lng project activity . the sales backlog for the equipment business at 30 september 2013 was $ 402 , compared to $ 450 at 30 september other operating income ( loss ) primarily includes other expense and income that cannot be directly associated with the business segments , including foreign exchange gains and losses . also included are lifo inventory valuation adjustments , as the business segments use fifo , and the lifo pool valuation adjustments are not allocated to the business segments . other also included stranded costs resulting from discontinued operations , as these costs were not reallocated to the businesses in 2012 . 2014 vs . 2013 other operating loss was $ 13.5 , compared to $ 4.7 in the prior year . the decrease was primarily due to unfavorable foreign exchange losses of $ 5 and lifo adjustments of $ 4 . 2013 vs . 2012 other operating loss was $ 4.7 , compared to $ 6.6 in the prior year . the other operating loss in 2013 includes an unfavorable lifo adjustment versus the prior year of $ 11 . the other operating loss in 2012 included stranded costs from discontinued operations of $ 10. .