the company recognizes accrued interest and penalties related to tax positions as a component of income tax expense and accounts for sales tax collected from customers and remitted to taxing authorities on a net basis . allowance for funds used during construction afudc is a non-cash credit to income with a corresponding charge to utility plant that represents the cost of borrowed funds or a return on equity funds devoted to plant under construction . the regulated utility subsidiaries record afudc to the extent permitted by the pucs . the portion of afudc attributable to borrowed funds is shown as a reduction of interest , net in the accompanying consolidated statements of operations . any portion of afudc attributable to equity funds would be included in other income ( expenses ) in the accompanying consolidated statements of operations . afudc is summarized in the following table for the years ended december 31: .

2015: allowance for other funds used during construction: 13
allowance for borrowed funds used during construction: 8
2014: allowance for other funds used during construction: 9
allowance for borrowed funds used during construction: 6
2013: allowance for other funds used during construction: 13
allowance for borrowed funds used during construction: 6

environmental costs the company 2019s water and wastewater operations are subject to u.s . federal , state , local and foreign requirements relating to environmental protection , and as such , the company periodically becomes subject to environmental claims in the normal course of business . environmental expenditures that relate to current operations or provide a future benefit are expensed or capitalized as appropriate . remediation costs that relate to an existing condition caused by past operations are accrued , on an undiscounted basis , when it is probable that these costs will be incurred and can be reasonably estimated . remediation costs accrued amounted to $ 1 and $ 2 as of december 31 , 2015 and 2014 , respectively . the accrual relates entirely to a conservation agreement entered into by a subsidiary of the company with the national oceanic and atmospheric administration ( 201cnoaa 201d ) requiring the company to , among other provisions , implement certain measures to protect the steelhead trout and its habitat in the carmel river watershed in the state of california . the company has agreed to pay $ 1 annually from 2010 to 2016 . the company 2019s inception-to-date costs related to the noaa agreement were recorded in regulatory assets in the accompanying consolidated balance sheets as of december 31 , 2015 and 2014 and are expected to be fully recovered from customers in future rates . derivative financial instruments the company uses derivative financial instruments for purposes of hedging exposures to fluctuations in interest rates . these derivative contracts are entered into for periods consistent with the related underlying exposures and do not constitute positions independent of those exposures . the company does not enter into derivative contracts for speculative purposes and does not use leveraged instruments . all derivatives are recognized on the balance sheet at fair value . on the date the derivative contract is entered into , the company may designate the derivative as a hedge of the fair value of a recognized asset or liability ( fair-value hedge ) or a hedge of a forecasted transaction or of the variability of cash flows to be received or paid related to a recognized asset or liability ( cash-flow hedge ) . changes in the fair value of a fair-value hedge , along with the gain or loss on the underlying hedged item , are recorded in current-period earnings . the effective portion of gains and losses on cash-flow hedges are recorded in other comprehensive income , until earnings are affected by the variability of cash flows . any ineffective portion of designated hedges is recognized in current-period earnings . cash flows from derivative contracts are included in net cash provided by operating activities in the accompanying consolidated statements of cash flows. .

Questions:
what was the change in the allowance for other funds used during construction from 2013 to 2014?
and how much does this change represent in relation to that allowance in 2013?

Answers:
-4
-44.4%