-27.12% is the change from 815 to 594
Calculation steps:
[( 594 - 815 ) ÷ 815] x 100 = -27.12%
Formula
Percentage change = [(594 - 815) / 815] x 100
Subtract the new number by the original number
594 - 815 = -221
-221 ÷ 815 = -0.27116564417177913
-0.27116564417177913 x 100 = -27.12%