-39.42% is the change from 657 to 398
Calculation steps:
[( 398 - 657 ) ÷ 657] x 100 = -39.42%
Formula
Percentage change = [(398 - 657) / 657] x 100
Subtract the new number by the original number
398 - 657 = -259
-259 ÷ 657 = -0.3942161339421613
-0.3942161339421613 x 100 = -39.42%