-30.72% is the change from 638 to 442
Calculation steps:
[( 442 - 638 ) ÷ 638] x 100 = -30.72%
Formula
Percentage change = [(442 - 638) / 638] x 100
Subtract the new number by the original number
442 - 638 = -196
-196 ÷ 638 = -0.3072100313479624
-0.3072100313479624 x 100 = -30.72%