-21.91% is the change from 858 to 670
Calculation steps:
[( 670 - 858 ) ÷ 858] x 100 = -21.91%
Formula
Percentage change = [(670 - 858) / 858] x 100
Subtract the new number by the original number
670 - 858 = -188
-188 ÷ 858 = -0.2191142191142191
-0.2191142191142191 x 100 = -21.91%