-75.39% is the change from 638 to 157
Calculation steps:
[( 157 - 638 ) ÷ 638] x 100 = -75.39%
Formula
Percentage change = [(157 - 638) / 638] x 100
Subtract the new number by the original number
157 - 638 = -481
-481 ÷ 638 = -0.7539184952978056
-0.7539184952978056 x 100 = -75.39%