apply as it has no impact on plan obligations . for 2015 , the healthcare trend rate was 7% ( 7 % ) , the ultimate trend rate was 5% ( 5 % ) , and the year the ultimate trend rate is reached was 2019 . projected benefit payments are as follows: .

****************************************
2017 | $ 11.5
2018 | 11.0
2019 | 10.7
2020 | 10.2
2021 | 9.7
2022 20132026 | 35.3
****************************************

these estimated benefit payments are based on assumptions about future events . actual benefit payments may vary significantly from these estimates . 17 . commitments and contingencies litigation we are involved in various legal proceedings , including commercial , competition , environmental , health , safety , product liability , and insurance matters . in september 2010 , the brazilian administrative council for economic defense ( cade ) issued a decision against our brazilian subsidiary , air products brasil ltda. , and several other brazilian industrial gas companies for alleged anticompetitive activities . cade imposed a civil fine of r$ 179.2 million ( approximately $ 55 at 30 september 2016 ) on air products brasil ltda . this fine was based on a recommendation by a unit of the brazilian ministry of justice , whose investigation began in 2003 , alleging violation of competition laws with respect to the sale of industrial and medical gases . the fines are based on a percentage of our total revenue in brazil in 2003 . we have denied the allegations made by the authorities and filed an appeal in october 2010 with the brazilian courts . on 6 may 2014 , our appeal was granted and the fine against air products brasil ltda . was dismissed . cade has appealed that ruling and the matter remains pending . we , with advice of our outside legal counsel , have assessed the status of this matter and have concluded that , although an adverse final judgment after exhausting all appeals is possible , such a judgment is not probable . as a result , no provision has been made in the consolidated financial statements . we estimate the maximum possible loss to be the full amount of the fine of r$ 179.2 million ( approximately $ 55 at 30 september 2016 ) plus interest accrued thereon until final disposition of the proceedings . other than this matter , we do not currently believe there are any legal proceedings , individually or in the aggregate , that are reasonably possible to have a material impact on our financial condition , results of operations , or cash flows . environmental in the normal course of business , we are involved in legal proceedings under the comprehensive environmental response , compensation , and liability act ( cercla : the federal superfund law ) ; resource conservation and recovery act ( rcra ) ; and similar state and foreign environmental laws relating to the designation of certain sites for investigation or remediation . presently , there are approximately 33 sites on which a final settlement has not been reached where we , along with others , have been designated a potentially responsible party by the environmental protection agency or are otherwise engaged in investigation or remediation , including cleanup activity at certain of our current and former manufacturing sites . we continually monitor these sites for which we have environmental exposure . accruals for environmental loss contingencies are recorded when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated . the consolidated balance sheets at 30 september 2016 and 2015 included an accrual of $ 81.4 and $ 80.6 , respectively , primarily as part of other noncurrent liabilities . the environmental liabilities will be paid over a period of up to 30 years . we estimate the exposure for environmental loss contingencies to range from $ 81 to a reasonably possible upper exposure of $ 95 as of 30 september 2016. .

Question: considering the years 2019-2020 , what was the decrease observed in the projected benefit payments?
Program: divide(10.2, 10.7), subtract(#0, const_1), multiply(#1, const_100)
Answer: -4.6729