-36.68% is the change from 638 to 404
Calculation steps:
[( 404 - 638 ) ÷ 638] x 100 = -36.68%
Formula
Percentage change = [(404 - 638) / 638] x 100
Subtract the new number by the original number
404 - 638 = -234
-234 ÷ 638 = -0.3667711598746082
-0.3667711598746082 x 100 = -36.68%