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.


entergy corporation and subsidiaries notes to financial statements computed on a rolling 12 month basis . as of december 31 , 2008 , entergy louisiana was in compliance with these provisions . as of december 31 , 2008 , entergy louisiana had future minimum lease payments ( reflecting an overall implicit rate of 7.45% ( 7.45 % ) ) in connection with the waterford 3 sale and leaseback transactions , which are recorded as long-term debt , as follows : amount ( in thousands ) . <table class='wikitable'><tr><td>1</td><td>-</td><td>amount ( in thousands )</td></tr><tr><td>2</td><td>2009</td><td>$ 32452</td></tr><tr><td>3</td><td>2010</td><td>35138</td></tr><tr><td>4</td><td>2011</td><td>50421</td></tr><tr><td>5</td><td>2012</td><td>39067</td></tr><tr><td>6</td><td>2013</td><td>26301</td></tr><tr><td>7</td><td>years thereafter</td><td>137858</td></tr><tr><td>8</td><td>total</td><td>321237</td></tr><tr><td>9</td><td>less : amount representing interest</td><td>73512</td></tr><tr><td>10</td><td>present value of net minimum lease payments</td><td>$ 247725</td></tr></table> grand gulf lease obligations in december 1988 , in two separate but substantially identical transactions , system energy sold and leased back undivided ownership interests in grand gulf for the aggregate sum of $ 500 million . the interests represent approximately 11.5% ( 11.5 % ) of grand gulf . the leases expire in 2015 . under certain circumstances , system entergy may repurchase the leased interests prior to the end of the term of the leases . at the end of the lease terms , system energy has the option to repurchase the leased interests in grand gulf at fair market value or to renew the leases for either fair market value or , under certain conditions , a fixed rate . in may 2004 , system energy caused the grand gulf lessors to refinance the outstanding bonds that they had issued to finance the purchase of their undivided interest in grand gulf . the refinancing is at a lower interest rate , and system energy's lease payments have been reduced to reflect the lower interest costs . system energy is required to report the sale-leaseback as a financing transaction in its financial statements . for financial reporting purposes , system energy expenses the interest portion of the lease obligation and the plant depreciation . however , operating revenues include the recovery of the lease payments because the transactions are accounted for as a sale and leaseback for ratemaking purposes . consistent with a recommendation contained in a ferc audit report , system energy initially recorded as a net regulatory asset the difference between the recovery of the lease payments and the amounts expensed for interest and depreciation and continues to record this difference as a regulatory asset or liability on an ongoing basis , resulting in a zero net balance for the regulatory asset at the end of the lease term . the amount of this net regulatory asset was $ 19.2 million and $ 36.6 million as of december 31 , 2008 and 2007 , respectively. .
Question: what was the amount of the net regulatory asset in 2008, in millions?
Answer: 19.2
Question: and what was it in 2007, also in millions?
Answer: 36.6
Question: what was, then, the change in amount over the year, in millions?

-17.4