-20.05% is the change from 858 to 686
Calculation steps:
[( 686 - 858 ) ÷ 858] x 100 = -20.05%
Formula
Percentage change = [(686 - 858) / 858] x 100
Subtract the new number by the original number
686 - 858 = -172
-172 ÷ 858 = -0.20046620046620048
-0.20046620046620048 x 100 = -20.05%