-39.7% is the change from 665 to 401
Calculation steps:
[( 401 - 665 ) ÷ 665] x 100 = -39.7%
Formula
Percentage change = [(401 - 665) / 665] x 100
Subtract the new number by the original number
401 - 665 = -264
-264 ÷ 665 = -0.3969924812030075
-0.3969924812030075 x 100 = -39.7%