-36.52% is the change from 638 to 405
Calculation steps:
[( 405 - 638 ) ÷ 638] x 100 = -36.52%
Formula
Percentage change = [(405 - 638) / 638] x 100
Subtract the new number by the original number
405 - 638 = -233
-233 ÷ 638 = -0.3652037617554859
-0.3652037617554859 x 100 = -36.52%