-21.94% is the change from 638 to 498
Calculation steps:
[( 498 - 638 ) ÷ 638] x 100 = -21.94%
Formula
Percentage change = [(498 - 638) / 638] x 100
Subtract the new number by the original number
498 - 638 = -140
-140 ÷ 638 = -0.219435736677116
-0.219435736677116 x 100 = -21.94%