-89.84% is the change from 817 to 83
Calculation steps:
[( 83 - 817 ) ÷ 817] x 100 = -89.84%
Formula
Percentage change = [(83 - 817) / 817] x 100
Subtract the new number by the original number
83 - 817 = -734
-734 ÷ 817 = -0.8984088127294981
-0.8984088127294981 x 100 = -89.84%