-87.81% is the change from 812 to 99
Calculation steps:
[( 99 - 812 ) ÷ 812] x 100 = -87.81%
Formula
Percentage change = [(99 - 812) / 812] x 100
Subtract the new number by the original number
99 - 812 = -713
-713 ÷ 812 = -0.8780788177339901
-0.8780788177339901 x 100 = -87.81%