-90.33% is the change from 858 to 83
Calculation steps:
[( 83 - 858 ) ÷ 858] x 100 = -90.33%
Formula
Percentage change = [(83 - 858) / 858] x 100
Subtract the new number by the original number
83 - 858 = -775
-775 ÷ 858 = -0.9032634032634033
-0.9032634032634033 x 100 = -90.33%