-22.41% is the change from 638 to 495
Calculation steps:
[( 495 - 638 ) ÷ 638] x 100 = -22.41%
Formula
Percentage change = [(495 - 638) / 638] x 100
Subtract the new number by the original number
495 - 638 = -143
-143 ÷ 638 = -0.22413793103448276
-0.22413793103448276 x 100 = -22.41%