-59.72% is the change from 638 to 257
Calculation steps:
[( 257 - 638 ) ÷ 638] x 100 = -59.72%
Formula
Percentage change = [(257 - 638) / 638] x 100
Subtract the new number by the original number
257 - 638 = -381
-381 ÷ 638 = -0.5971786833855799
-0.5971786833855799 x 100 = -59.72%