-27.48% is the change from 815 to 591
Calculation steps:
[( 591 - 815 ) ÷ 815] x 100 = -27.48%
Formula
Percentage change = [(591 - 815) / 815] x 100
Subtract the new number by the original number
591 - 815 = -224
-224 ÷ 815 = -0.2748466257668712
-0.2748466257668712 x 100 = -27.48%