-27.98% is the change from 815 to 587
Calculation steps:
[( 587 - 815 ) ÷ 815] x 100 = -27.98%
Formula
Percentage change = [(587 - 815) / 815] x 100
Subtract the new number by the original number
587 - 815 = -228
-228 ÷ 815 = -0.27975460122699386
-0.27975460122699386 x 100 = -27.98%