-99.01% is the change from 809 to 8
Calculation steps:
[( 8 - 809 ) ÷ 809] x 100 = -99.01%
Formula
Percentage change = [(8 - 809) / 809] x 100
Subtract the new number by the original number
8 - 809 = -801
-801 ÷ 809 = -0.9901112484548825
-0.9901112484548825 x 100 = -99.01%