gain on previously held equity interest on 30 december 2014 , we acquired our partner 2019s equity ownership interest in a liquefied atmospheric industrial gases production joint venture in north america for $ 22.6 , which increased our ownership from 50% ( 50 % ) to 100% ( 100 % ) . the transaction was accounted for as a business combination , and subsequent to the acquisition , the results were consolidated within our industrial gases 2013 americas segment . we recorded a gain of $ 17.9 ( $ 11.2 after-tax , or $ .05 per share ) as a result of revaluing our previously held equity interest to fair value as of the acquisition date . refer to note 6 , business combination , to the consolidated financial statements for additional details . other income ( expense ) , net items recorded to other income ( expense ) , net arise from transactions and events not directly related to our principal income earning activities . the detail of other income ( expense ) , net is presented in note 23 , supplemental information , to the consolidated financial statements . 2017 vs . 2016 other income ( expense ) , net of $ 121.0 increased $ 71.6 , primarily due to income from transition services agreements with versum and evonik , income from the sale of assets and investments , including a gain of $ 12.2 ( $ 7.6 after-tax , or $ .03 per share ) resulting from the sale of a parcel of land , and a favorable foreign exchange impact . 2016 vs . 2015 other income ( expense ) , net of $ 49.4 increased $ 3.9 , primarily due to lower foreign exchange losses , favorable contract settlements , and receipt of a government subsidy . fiscal year 2015 included a gain of $ 33.6 ( $ 28.3 after tax , or $ .13 per share ) resulting from the sale of two parcels of land . no other individual items were significant in comparison to fiscal year 2015 . interest expense .

2017: interest incurred: 139.6
less : capitalized interest: 19
interest expense: 120.6
2016: interest incurred: 147.9
less : capitalized interest: 32.7
interest expense: 115.2
2015: interest incurred: 151.9
less : capitalized interest: 49.1
interest expense: 102.8

2017 vs . 2016 interest incurred decreased $ 8.3 as the impact from a lower average debt balance of $ 26 was partially offset by the impact from a higher average interest rate on the debt portfolio of $ 19 . the change in capitalized interest was driven by a decrease in the carrying value of projects under construction , primarily as a result of our decision to exit from the energy-from-waste business . 2016 vs . 2015 interest incurred decreased $ 4.0 . the decrease primarily resulted from a stronger u.s . dollar on the translation of foreign currency interest of $ 6 , partially offset by a higher average debt balance of $ 2 . the change in capitalized interest was driven by a decrease in the carrying value of projects under construction , primarily as a result of our exit from the energy-from-waste business . other non-operating income ( expense ) , net other non-operating income ( expense ) , net of $ 29.0 in fiscal year 2017 primarily resulted from interest income on cash and time deposits , which are comprised primarily of proceeds from the sale of pmd . interest income was included in "other income ( expense ) , net" in 2016 and 2015 . interest income in previous periods was not material . loss on extinguishment of debt on 30 september 2016 , in anticipation of the spin-off of emd , versum issued $ 425.0 of notes to air products , who then exchanged these notes with certain financial institutions for $ 418.3 of air products 2019 outstanding commercial paper . this noncash exchange , which was excluded from the consolidated statements of cash flows , resulted in a loss of $ 6.9 ( $ 4.3 after-tax , or $ .02 per share ) . in september 2015 , we made a payment of $ 146.6 to redeem 3000000 unidades de fomento ( 201cuf 201d ) series e 6.30% ( 6.30 % ) bonds due 22 january 2030 that had a carrying value of $ 130.0 and resulted in a net loss of $ 16.6 ( $ 14.2 after-tax , or $ .07 per share ) . .

Questions:
what was the change observed in the capitalized interest from 2015 to 2016?
and what was that capitalized interest in 2015?
how much, then, does that change represent in relation to this 2015 capitalized interest?

Answers:
-16.4
49.1
-33.40%