-34.64% is the change from 638 to 417
Calculation steps:
[( 417 - 638 ) ÷ 638] x 100 = -34.64%
Formula
Percentage change = [(417 - 638) / 638] x 100
Subtract the new number by the original number
417 - 638 = -221
-221 ÷ 638 = -0.3463949843260188
-0.3463949843260188 x 100 = -34.64%