-21.26% is the change from 635 to 500
Calculation steps:
[( 500 - 635 ) ÷ 635] x 100 = -21.26%
Formula
Percentage change = [(500 - 635) / 635] x 100
Subtract the new number by the original number
500 - 635 = -135
-135 ÷ 635 = -0.2125984251968504
-0.2125984251968504 x 100 = -21.26%