{"pre_text": ["third-party sales for this segment increased 4% ( 4 % ) in 2014 compared with 2013 , primarily due to higher volumes and the acquisition of firth rixson ( $ 81 2014see above ) .", "the higher volumes were mostly related to the aerospace ( commercial ) and commercial transportation end markets , somewhat offset by lower volumes in the industrial gas turbine end market .", "atoi for the engineered products and solutions segment increased $ 16 in 2015 compared with 2014 , principally the result of net productivity improvements across most businesses , a positive contribution from inorganic growth , and overall higher volumes in this segment 2019s organic businesses .", "these positive impacts were partially offset by unfavorable price/product mix , higher costs related to growth projects , and net unfavorable foreign currency movements , primarily related to a weaker euro .", "atoi for this segment climbed $ 10 in 2014 compared with 2013 , mainly due to net productivity improvements across all businesses and overall higher volumes , partially offset by higher costs , primarily labor , and unfavorable product in 2016 , demand in the commercial aerospace end market is expected to remain strong , driven by significant order backlog .", "also , third-party sales will include a positive impact due to a full year of sales related to the acquisitions of rti and tital .", "additionally , net productivity improvements are anticipated while pricing pressure across all markets is expected .", "transportation and construction solutions ."], "post_text": ["this segment represents a portion of alcoa 2019s downstream operations and 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 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 mostly the u.s .", "dollar , the euro , and the brazilian real .", "third-party sales for the transportation and construction solutions 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 .", "third-party sales for this segment increased 4% ( 4 % ) in 2014 compared with 2013 , mostly the result of higher volume related to the commercial transportation and building and construction end markets , somewhat offset by lower volume in the industrial products and market .", "atoi for the transportation and construction solutions segment declined $ 14 in 2015 compared with 2014 , mainly due to higher costs , net unfavorable foreign currency movements , primarily related to a weaker euro and brazilian real , and unfavorable price/product mix .", "these negative impacts were mostly offset by net productivity improvements across all businesses .", "atoi for this segment improved $ 13 in 2014 compared with 2013 , principally attributable to net productivity improvements across all businesses and overall higher volumes , partially offset by unfavorable product mix and higher costs , primarily labor .", "in 2016 , the non-residential building and construction end market is expected to improve through growth in north america but will be slightly offset by overall weakness in europe .", "also , north america build rates in the commercial ."], "table": [["", "2015", "2014", "2013"], ["third-party sales", "$ 1882", "$ 2021", "$ 1951"], ["atoi", "$ 166", "$ 180", "$ 167"]], "table_ori": [["", "2015", "2014", "2013"], ["Third-party sales", "$1,882", "$2,021", "$1,951"], ["ATOI", "$166", "$180", "$167"]]}

Question: considering the 2013-2014 period , what is the percentual improvement of net productivity and overall higher volumes concerning the atoi?
Evidence:
table_2: the atoi of 2015 is $ 166 ; the atoi of 2014 is $ 180 ; the atoi of 2013 is $ 167 ;
text_17: atoi for this segment improved $ 13 in 2014 compared with 2013 , principally attributable to net productivity improvements across all businesses and overall higher volumes , partially offset by unfavorable product mix and higher costs , primarily labor .
Program: divide(13, 167), multiply(#0, const_100)
Answer:
str_answer: 7.7%
exe_answer: 7.78443