-2.21% is the change from 858 to 839
Calculation steps:
[( 839 - 858 ) ÷ 858] x 100 = -2.21%
Formula
Percentage change = [(839 - 858) / 858] x 100
Subtract the new number by the original number
839 - 858 = -19
-19 ÷ 858 = -0.022144522144522144
-0.022144522144522144 x 100 = -2.21%