-99.02% is the change from 813 to 8
Calculation steps:
[( 8 - 813 ) ÷ 813] x 100 = -99.02%
Formula
Percentage change = [(8 - 813) / 813] x 100
Subtract the new number by the original number
8 - 813 = -805
-805 ÷ 813 = -0.990159901599016
-0.990159901599016 x 100 = -99.02%