-86.53% is the change from 631 to 85
Calculation steps:
[( 85 - 631 ) ÷ 631] x 100 = -86.53%
Formula
Percentage change = [(85 - 631) / 631] x 100
Subtract the new number by the original number
85 - 631 = -546
-546 ÷ 631 = -0.8652931854199684
-0.8652931854199684 x 100 = -86.53%