restructuring and other charges 2014restructuring and other charges for each year in the three-year period ended december 31 , 2015 were comprised of the following: .
what is the percentual growth observed in the percentage of asset impairment costs concerning the restructuring and other charges costs during 2013 and 2014?
layoff costs were recorded based on approved detailed action plans submitted by the operating locations that specified positions to be eliminated , benefits to be paid under existing severance plans , union contracts or statutory requirements , and the expected timetable for completion of the plans . 2015 actions . in 2015 , alcoa recorded restructuring and other charges of $ 1195 ( $ 836 after-tax and noncontrolling interest ) , which were comprised of the following components : $ 438 ( $ 281 after-tax and noncontrolling interest ) for exit costs related to decisions to permanently shut down and demolish three smelters and a power station ( see below ) ; $ 246 ( $ 118 after-tax and noncontrolling interest ) for the curtailment of two refineries and two smelters ( see below ) ; $ 201 ( pre- and after-tax ) related to legal matters in italy ; a $ 161 ( $ 151 after-tax and noncontrolling interest ) net loss related to the march 2015 divestiture of a rolling mill in russia ( see global rolled products in segment information below ) and post-closing adjustments associated with three december 2014 divestitures ; $ 143 ( $ 102 after-tax and noncontrolling interest ) for layoff costs , including the separation of approximately 2100 employees ( 425 in the transportation and construction solutions segment , 645 in the engineered products and solutions segment , 380 in the primary metals segment , 90 in the global rolled products segment , 85 in the alumina segment , and 475 in corporate ) ; $ 34 ( $ 14 after-tax and noncontrolling interest ) for asset impairments , virtually all of which was related to prior capitalized costs for an expansion project at a refinery in australia that is no longer being pursued ; an $ 18 ( $ 13 after- tax ) gain on the sale of land related to one of the rolling mills in australia that was permanently closed in december 2014 ( see 2014 actions below ) ; a net charge of $ 4 ( a net credit of $ 7 after-tax and noncontrolling interest ) for other miscellaneous items ; and $ 14 ( $ 11 after-tax and noncontrolling interest ) for the reversal of a number of small layoff reserves related to prior periods . during 2015 , management initiated various alumina refining and aluminum smelting capacity curtailments and/or closures . the curtailments were composed of the remaining capacity at all of the following : the s e3o lu eds smelter in brazil ( 74 kmt-per-year ) ; the suriname refinery ( 1330 kmt-per-year ) ; the point comfort , tx refinery ( 2010 kmt-per- year ) ; and the wenatchee , wa smelter ( 143 kmt-per-year ) . all of the curtailments were completed in 2015 except for 1635 kmt-per-year at the point comfort refinery , which is expected to be completed by the end of june 2016 . the permanent closures were composed of the capacity at the warrick , in smelter ( 269 kmt-per-year ) ( includes the closure of a related coal mine ) and the infrastructure of the massena east , ny smelter ( potlines were previously shut down in both 2013 and 2014 2014see 2013 actions and 2014 actions below ) , as the modernization of this smelter is no longer being pursued . the shutdown of the warrick smelter is expected to be completed by the end of march 2016 . the decisions on the above actions were part of a separate 12-month review in refining ( 2800 kmt-per-year ) and smelting ( 500 kmt-per-year ) capacity initiated by management in march 2015 for possible curtailment ( partial or full ) , permanent closure or divestiture . while many factors contributed to each decision , in general , these actions were initiated to maintain competitiveness amid prevailing market conditions for both alumina and aluminum . demolition and remediation activities related to the warrick smelter and the massena east location will begin in 2016 and are expected to be completed by the end of 2020 . separate from the actions initiated under the reviews described above , in mid-2015 , management approved the permanent shutdown and demolition of the po e7os de caldas smelter ( capacity of 96 kmt-per-year ) in brazil and the .