-22.1% is the change from 638 to 497
Calculation steps:
[( 497 - 638 ) ÷ 638] x 100 = -22.1%
Formula
Percentage change = [(497 - 638) / 638] x 100
Subtract the new number by the original number
497 - 638 = -141
-141 ÷ 638 = -0.22100313479623823
-0.22100313479623823 x 100 = -22.1%