-97.79% is the change from 858 to 19
Calculation steps:
[( 19 - 858 ) ÷ 858] x 100 = -97.79%
Formula
Percentage change = [(19 - 858) / 858] x 100
Subtract the new number by the original number
19 - 858 = -839
-839 ÷ 858 = -0.9778554778554779
-0.9778554778554779 x 100 = -97.79%