-27.74% is the change from 858 to 620
Calculation steps:
[( 620 - 858 ) ÷ 858] x 100 = -27.74%
Formula
Percentage change = [(620 - 858) / 858] x 100
Subtract the new number by the original number
620 - 858 = -238
-238 ÷ 858 = -0.2773892773892774
-0.2773892773892774 x 100 = -27.74%