-36.36% is the change from 638 to 406
Calculation steps:
[( 406 - 638 ) ÷ 638] x 100 = -36.36%
Formula
Percentage change = [(406 - 638) / 638] x 100
Subtract the new number by the original number
406 - 638 = -232
-232 ÷ 638 = -0.36363636363636365
-0.36363636363636365 x 100 = -36.36%