-28.59% is the change from 815 to 582
Calculation steps:
[( 582 - 815 ) ÷ 815] x 100 = -28.59%
Formula
Percentage change = [(582 - 815) / 815] x 100
Subtract the new number by the original number
582 - 815 = -233
-233 ÷ 815 = -0.28588957055214725
-0.28588957055214725 x 100 = -28.59%