-0.23% is the change from 858 to 856
Calculation steps:
[( 856 - 858 ) ÷ 858] x 100 = -0.23%
Formula
Percentage change = [(856 - 858) / 858] x 100
Subtract the new number by the original number
856 - 858 = -2
-2 ÷ 858 = -0.002331002331002331
-0.002331002331002331 x 100 = -0.23%