-34.95% is the change from 638 to 415
Calculation steps:
[( 415 - 638 ) ÷ 638] x 100 = -34.95%
Formula
Percentage change = [(415 - 638) / 638] x 100
Subtract the new number by the original number
415 - 638 = -223
-223 ÷ 638 = -0.3495297805642633
-0.3495297805642633 x 100 = -34.95%