-8.93% is the change from 638 to 581
Calculation steps:
[( 581 - 638 ) ÷ 638] x 100 = -8.93%
Formula
Percentage change = [(581 - 638) / 638] x 100
Subtract the new number by the original number
581 - 638 = -57
-57 ÷ 638 = -0.08934169278996865
-0.08934169278996865 x 100 = -8.93%