-26.75% is the change from 815 to 597
Calculation steps:
[( 597 - 815 ) ÷ 815] x 100 = -26.75%
Formula
Percentage change = [(597 - 815) / 815] x 100
Subtract the new number by the original number
597 - 815 = -218
-218 ÷ 815 = -0.2674846625766871
-0.2674846625766871 x 100 = -26.75%