-99.03% is the change from 828 to 8
Calculation steps:
[( 8 - 828 ) ÷ 828] x 100 = -99.03%
Formula
Percentage change = [(8 - 828) / 828] x 100
Subtract the new number by the original number
8 - 828 = -820
-820 ÷ 828 = -0.9903381642512077
-0.9903381642512077 x 100 = -99.03%