-8.5% is the change from 635 to 581
Calculation steps:
[( 581 - 635 ) ÷ 635] x 100 = -8.5%
Formula
Percentage change = [(581 - 635) / 635] x 100
Subtract the new number by the original number
581 - 635 = -54
-54 ÷ 635 = -0.08503937007874016
-0.08503937007874016 x 100 = -8.5%