-40.15% is the change from 665 to 398
Calculation steps:
[( 398 - 665 ) ÷ 665] x 100 = -40.15%
Formula
Percentage change = [(398 - 665) / 665] x 100
Subtract the new number by the original number
398 - 665 = -267
-267 ÷ 665 = -0.40150375939849625
-0.40150375939849625 x 100 = -40.15%