-33.19% is the change from 955 to 638
Calculation steps:
[( 638 - 955 ) ÷ 955] x 100 = -33.19%
Formula
Percentage change = [(638 - 955) / 955] x 100
Subtract the new number by the original number
638 - 955 = -317
-317 ÷ 955 = -0.3319371727748691
-0.3319371727748691 x 100 = -33.19%