-29.94% is the change from 815 to 571
Calculation steps:
[( 571 - 815 ) ÷ 815] x 100 = -29.94%
Formula
Percentage change = [(571 - 815) / 815] x 100
Subtract the new number by the original number
571 - 815 = -244
-244 ÷ 815 = -0.29938650306748466
-0.29938650306748466 x 100 = -29.94%