-40.68% is the change from 531 to 315
Calculation steps:
[( 315 - 531 ) ÷ 531] x 100 = -40.68%
Formula
Percentage change = [(315 - 531) / 531] x 100
Subtract the new number by the original number
315 - 531 = -216
-216 ÷ 531 = -0.4067796610169492
-0.4067796610169492 x 100 = -40.68%