-8.31% is the change from 638 to 585
Calculation steps:
[( 585 - 638 ) ÷ 638] x 100 = -8.31%
Formula
Percentage change = [(585 - 638) / 638] x 100
Subtract the new number by the original number
585 - 638 = -53
-53 ÷ 638 = -0.08307210031347963
-0.08307210031347963 x 100 = -8.31%