-99.03% is the change from 823 to 8
Calculation steps:
[( 8 - 823 ) ÷ 823] x 100 = -99.03%
Formula
Percentage change = [(8 - 823) / 823] x 100
Subtract the new number by the original number
8 - 823 = -815
-815 ÷ 823 = -0.9902794653705954
-0.9902794653705954 x 100 = -99.03%