-26.01% is the change from 815 to 603
Calculation steps:
[( 603 - 815 ) ÷ 815] x 100 = -26.01%
Formula
Percentage change = [(603 - 815) / 815] x 100
Subtract the new number by the original number
603 - 815 = -212
-212 ÷ 815 = -0.26012269938650306
-0.26012269938650306 x 100 = -26.01%