other long term debt in december 2012 , the company entered into a $ 50.0 million recourse loan collateralized by the land , buildings and tenant improvements comprising the company 2019s corporate headquarters . the loan has a seven year term and maturity date of december 2019 . the loan bears interest at one month libor plus a margin of 1.50% ( 1.50 % ) , and allows for prepayment without penalty . the loan includes covenants and events of default substantially consistent with the company 2019s credit agreement discussed above . the loan also requires prior approval of the lender for certain matters related to the property , including transfers of any interest in the property . as of december 31 , 2017 and 2016 , the outstanding balance on the loan was $ 40.0 million and $ 42.0 million , respectively . the weighted average interest rate on the loan was 2.5% ( 2.5 % ) and 2.0% ( 2.0 % ) for the years ended december 31 , 2017 and 2016 , respectively . the following are the scheduled maturities of long term debt as of december 31 , 2017 : ( in thousands ) .

$ 27000: 2019: 63000
2020: 25000
2021: 86250
2022: 2014
2023 and thereafter: 600000
total scheduled maturities of long term debt: 801250
current maturities of long term debt: 27000

interest expense , net was $ 34.5 million , $ 26.4 million , and $ 14.6 million for the years ended december 31 , 2017 , 2016 and 2015 , respectively . interest expense includes the amortization of deferred financing costs , bank fees , capital and built-to-suit lease interest and interest expense under the credit and other long term debt facilities . amortization of deferred financing costs was $ 1.3 million , $ 1.2 million , and $ 0.8 million for the years ended december 31 , 2017 , 2016 and 2015 , respectively . the company monitors the financial health and stability of its lenders under the credit and other long term debt facilities , however during any period of significant instability in the credit markets lenders could be negatively impacted in their ability to perform under these facilities . 7 . commitments and contingencies obligations under operating leases the company leases warehouse space , office facilities , space for its brand and factory house stores and certain equipment under non-cancelable operating leases . the leases expire at various dates through 2033 , excluding extensions at the company 2019s option , and include provisions for rental adjustments . the table below includes executed lease agreements for brand and factory house stores that the company did not yet occupy as of december 31 , 2017 and does not include contingent rent the company may incur at its stores based on future sales above a specified minimum or payments made for maintenance , insurance and real estate taxes . the following is a schedule of future minimum lease payments for non-cancelable real property operating leases as of december 31 , 2017 as well as .

Questions:
what was the interest expense net in 2016?
and what was it in 2015?
what was then, the change over the year?
what was the interest expense net in 2015?
and how much does that change represent in relation to this 2015 interest expense net, in percentage?

Answers:
26.4
14.6
11.8
14.6
81%