-60.03% is the change from 638 to 255
Calculation steps:
[( 255 - 638 ) ÷ 638] x 100 = -60.03%
Formula
Percentage change = [(255 - 638) / 638] x 100
Subtract the new number by the original number
255 - 638 = -383
-383 ÷ 638 = -0.6003134796238244
-0.6003134796238244 x 100 = -60.03%