-0.12% is the change from 858 to 857
Calculation steps:
[( 857 - 858 ) ÷ 858] x 100 = -0.12%
Formula
Percentage change = [(857 - 858) / 858] x 100
Subtract the new number by the original number
857 - 858 = -1
-1 ÷ 858 = -0.0011655011655011655
-0.0011655011655011655 x 100 = -0.12%