-32.45% is the change from 638 to 431
Calculation steps:
[( 431 - 638 ) ÷ 638] x 100 = -32.45%
Formula
Percentage change = [(431 - 638) / 638] x 100
Subtract the new number by the original number
431 - 638 = -207
-207 ÷ 638 = -0.32445141065830724
-0.32445141065830724 x 100 = -32.45%