-98.89% is the change from 813 to 9
Calculation steps:
[( 9 - 813 ) ÷ 813] x 100 = -98.89%
Formula
Percentage change = [(9 - 813) / 813] x 100
Subtract the new number by the original number
9 - 813 = -804
-804 ÷ 813 = -0.988929889298893
-0.988929889298893 x 100 = -98.89%