-25.64% is the change from 858 to 638
Calculation steps:
[( 638 - 858 ) ÷ 858] x 100 = -25.64%
Formula
Percentage change = [(638 - 858) / 858] x 100
Subtract the new number by the original number
638 - 858 = -220
-220 ÷ 858 = -0.2564102564102564
-0.2564102564102564 x 100 = -25.64%