-89.74% is the change from 809 to 83
Calculation steps:
[( 83 - 809 ) ÷ 809] x 100 = -89.74%
Formula
Percentage change = [(83 - 809) / 809] x 100
Subtract the new number by the original number
83 - 809 = -726
-726 ÷ 809 = -0.8974042027194067
-0.8974042027194067 x 100 = -89.74%