-86.31% is the change from 621 to 85
Calculation steps:
[( 85 - 621 ) ÷ 621] x 100 = -86.31%
Formula
Percentage change = [(85 - 621) / 621] x 100
Subtract the new number by the original number
85 - 621 = -536
-536 ÷ 621 = -0.8631239935587761
-0.8631239935587761 x 100 = -86.31%