-4.31% is the change from 858 to 821
Calculation steps:
[( 821 - 858 ) ÷ 858] x 100 = -4.31%
Formula
Percentage change = [(821 - 858) / 858] x 100
Subtract the new number by the original number
821 - 858 = -37
-37 ÷ 858 = -0.04312354312354312
-0.04312354312354312 x 100 = -4.31%