-98.89% is the change from 811 to 9
Calculation steps:
[( 9 - 811 ) ÷ 811] x 100 = -98.89%
Formula
Percentage change = [(9 - 811) / 811] x 100
Subtract the new number by the original number
9 - 811 = -802
-802 ÷ 811 = -0.9889025893958077
-0.9889025893958077 x 100 = -98.89%