-96.39% is the change from 858 to 31
Calculation steps:
[( 31 - 858 ) ÷ 858] x 100 = -96.39%
Formula
Percentage change = [(31 - 858) / 858] x 100
Subtract the new number by the original number
31 - 858 = -827
-827 ÷ 858 = -0.9638694638694638
-0.9638694638694638 x 100 = -96.39%