-21.1% is the change from 858 to 677
Calculation steps:
[( 677 - 858 ) ÷ 858] x 100 = -21.1%
Formula
Percentage change = [(677 - 858) / 858] x 100
Subtract the new number by the original number
677 - 858 = -181
-181 ÷ 858 = -0.21095571095571095
-0.21095571095571095 x 100 = -21.1%