Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.

Text: republic services , inc . notes to consolidated financial statements 2014 ( continued ) 16 . financial instruments fuel hedges we have entered into multiple swap agreements designated as cash flow hedges to mitigate some of our exposure related to changes in diesel fuel prices . these swaps qualified for , and were designated as , effective hedges of changes in the prices of forecasted diesel fuel purchases ( fuel hedges ) . the following table summarizes our outstanding fuel hedges as of december 31 , 2016 : year gallons hedged weighted average contract price per gallon . <table class='wikitable'><tr><td>1</td><td>year</td><td>gallons hedged</td><td>weighted average contractprice per gallon</td></tr><tr><td>2</td><td>2017</td><td>12000000</td><td>$ 2.92</td></tr><tr><td>3</td><td>2018</td><td>3000000</td><td>2.61</td></tr></table> if the national u.s . on-highway average price for a gallon of diesel fuel as published by the department of energy exceeds the contract price per gallon , we receive the difference between the average price and the contract price ( multiplied by the notional gallons ) from the counterparty . if the average price is less than the contract price per gallon , we pay the difference to the counterparty . the fair values of our fuel hedges are determined using standard option valuation models with assumptions about commodity prices based on those observed in underlying markets ( level 2 in the fair value hierarchy ) . the aggregate fair values of our outstanding fuel hedges as of december 31 , 2016 and 2015 were current liabilities of $ 2.7 million and $ 37.8 million , respectively , and have been recorded in other accrued liabilities in our consolidated balance sheets . the ineffective portions of the changes in fair values resulted in a gain of $ 0.8 million for the year ended december 31 , 2016 , and a loss of $ 0.4 million and $ 0.5 million for the years ended december 31 , 2015 and 2014 , respectively , and have been recorded in other income , net in our consolidated statements of income . total gain ( loss ) recognized in other comprehensive income ( loss ) for fuel hedges ( the effective portion ) was $ 20.7 million , $ ( 2.0 ) million and $ ( 24.2 ) million , for the years ended december 31 , 2016 , 2015 and 2014 , respectively . we classify cash inflows and outflows from our fuel hedges within operating activities in the unaudited consolidated statements of cash flows . recycling commodity hedges revenue from the sale of recycled commodities is primarily from sales of old corrugated containers and old newsprint . from time to time we use derivative instruments such as swaps and costless collars designated as cash flow hedges to manage our exposure to changes in prices of these commodities . during 2016 , we entered into multiple agreements related to the forecasted occ sales . the agreements qualified for , and were designated as , effective hedges of changes in the prices of certain forecasted recycling commodity sales ( commodity hedges ) . we entered into costless collar agreements on forecasted sales of occ . the agreements involve combining a purchased put option giving us the right to sell occ at an established floor strike price with a written call option obligating us to deliver occ at an established cap strike price . the puts and calls have the same settlement dates , are net settled in cash on such dates and have the same terms to expiration . the contemporaneous combination of options resulted in no net premium for us and represents costless collars . under these agreements , we will make or receive no payments as long as the settlement price is between the floor price and cap price ; however , if the settlement price is above the cap , we will pay the counterparty an amount equal to the excess of the settlement price over the cap times the monthly volumes hedged . if the settlement price is below the floor , the counterparty will pay us the deficit of the settlement price below the floor times the monthly volumes hedged . the objective of these agreements is to reduce variability of cash flows for forecasted sales of occ between two designated strike prices. .
Question: how much did the gallons hedged in 2018 represent in relation to the ones hedged in 2017?
Answer: 4.0
Question: and in the previous year of this period, what was the aggregate fair value of the outstanding fuel hedges?
Answer: 37.8
Question: what was it in 2015?

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