-56.5% is the change from 915 to 398
Calculation steps:
[( 398 - 915 ) ÷ 915] x 100 = -56.5%
Formula
Percentage change = [(398 - 915) / 915] x 100
Subtract the new number by the original number
398 - 915 = -517
-517 ÷ 915 = -0.5650273224043716
-0.5650273224043716 x 100 = -56.5%