-86.28% is the change from 991 to 136
Calculation steps:
[( 136 - 991 ) ÷ 991] x 100 = -86.28%
Formula
Percentage change = [(136 - 991) / 991] x 100
Subtract the new number by the original number
136 - 991 = -855
-855 ÷ 991 = -0.8627648839556004
-0.8627648839556004 x 100 = -86.28%