-90.79% is the change from 858 to 79
Calculation steps:
[( 79 - 858 ) ÷ 858] x 100 = -90.79%
Formula
Percentage change = [(79 - 858) / 858] x 100
Subtract the new number by the original number
79 - 858 = -779
-779 ÷ 858 = -0.9079254079254079
-0.9079254079254079 x 100 = -90.79%