-31.82% is the change from 638 to 435
Calculation steps:
[( 435 - 638 ) ÷ 638] x 100 = -31.82%
Formula
Percentage change = [(435 - 638) / 638] x 100
Subtract the new number by the original number
435 - 638 = -203
-203 ÷ 638 = -0.3181818181818182
-0.3181818181818182 x 100 = -31.82%