-50.7% is the change from 858 to 423
Calculation steps:
[( 423 - 858 ) ÷ 858] x 100 = -50.7%
Formula
Percentage change = [(423 - 858) / 858] x 100
Subtract the new number by the original number
423 - 858 = -435
-435 ÷ 858 = -0.506993006993007
-0.506993006993007 x 100 = -50.7%