-95.1% is the change from 858 to 42
Calculation steps:
[( 42 - 858 ) ÷ 858] x 100 = -95.1%
Formula
Percentage change = [(42 - 858) / 858] x 100
Subtract the new number by the original number
42 - 858 = -816
-816 ÷ 858 = -0.951048951048951
-0.951048951048951 x 100 = -95.1%