-26.99% is the change from 815 to 595
Calculation steps:
[( 595 - 815 ) ÷ 815] x 100 = -26.99%
Formula
Percentage change = [(595 - 815) / 815] x 100
Subtract the new number by the original number
595 - 815 = -220
-220 ÷ 815 = -0.26993865030674846
-0.26993865030674846 x 100 = -26.99%