third-party sales for the engineered products and solutions segment improved 7% ( 7 % ) in 2016 compared with 2015 , primarily attributable to higher third-party sales of the two acquired businesses ( $ 457 ) , primarily related to the aerospace end market , and increased demand from the industrial gas turbine end market , partially offset by lower volumes in the oil and gas end market and commercial transportation end market as well as pricing pressures in aerospace . third-party sales for this segment improved 27% ( 27 % ) in 2015 compared with 2014 , largely attributable to the third-party sales ( $ 1310 ) of the three acquired businesses ( see above ) , and higher volumes in this segment 2019s legacy businesses , both of which were primarily related to the aerospace end market . these positive impacts were slightly offset by unfavorable foreign currency movements , principally driven by a weaker euro . atoi for the engineered products and solutions segment increased $ 47 , or 8% ( 8 % ) , in 2016 compared with 2015 , primarily related to net productivity improvements across all businesses as well as the volume increase from both the rti acquisition and organic revenue growth , partially offset by a lower margin product mix and pricing pressures in the aerospace end market . atoi for this segment increased $ 16 , or 3% ( 3 % ) , in 2015 compared with 2014 , principally the result of net productivity improvements across most businesses , a positive contribution from acquisitions , and overall higher volumes in this segment 2019s legacy businesses . these positive impacts were partially offset by unfavorable price and product mix , higher costs related to growth projects , and net unfavorable foreign currency movements , primarily related to a weaker euro . in 2017 , demand in the commercial aerospace end market is expected to remain strong , driven by the ramp up of new aerospace engine platforms , somewhat offset by continued customer destocking and engine ramp-up challenges . demand in the defense end market is expected to grow due to the continuing ramp-up of certain aerospace programs . additionally , net productivity improvements are anticipated while pricing pressure across all markets is likely to continue . transportation and construction solutions .
considering the years 2015-2016 , what was the variation observed in the growth of the atoi in the transportation and construction solutions engineered products and solutions segments?
the transportation and construction solutions segment produces products that are used mostly in the nonresidential building and construction and commercial transportation end markets . such products include integrated aluminum structural systems , architectural extrusions , and forged aluminum commercial vehicle wheels , which are sold both directly to customers and through distributors . a small part of this segment also produces aluminum products for the industrial products end market . generally , the sales and costs and expenses of this segment are transacted in the local currency of the respective operations , which are primarily the u.s . dollar , the euro , and the brazilian real . third-party sales for the transportation and construction solutions segment decreased 4% ( 4 % ) in 2016 compared with 2015 , primarily driven by lower demand from the north american commercial transportation end market , which was partially offset by rising demand from the building and construction end market . third-party sales for this segment decreased 7% ( 7 % ) in 2015 compared with 2014 , primarily driven by unfavorable foreign currency movements , principally caused by a weaker euro and brazilian real , and lower volume related to the building and construction end market , somewhat offset by higher volume related to the commercial transportation end market . atoi for the transportation and construction solutions segment increased $ 10 , or 6% ( 6 % ) , in 2016 compared with 2015 , principally driven by net productivity improvements across all businesses and growth in the building and construction segment , partially offset by lower demand in the north american heavy duty truck and brazilian markets. .