-97.32% is the change from 858 to 23
Calculation steps:
[( 23 - 858 ) ÷ 858] x 100 = -97.32%
Formula
Percentage change = [(23 - 858) / 858] x 100
Subtract the new number by the original number
23 - 858 = -835
-835 ÷ 858 = -0.9731934731934732
-0.9731934731934732 x 100 = -97.32%