-70.16% is the change from 858 to 256
Calculation steps:
[( 256 - 858 ) ÷ 858] x 100 = -70.16%
Formula
Percentage change = [(256 - 858) / 858] x 100
Subtract the new number by the original number
256 - 858 = -602
-602 ÷ 858 = -0.7016317016317016
-0.7016317016317016 x 100 = -70.16%