-30.06% is the change from 815 to 570
Calculation steps:
[( 570 - 815 ) ÷ 815] x 100 = -30.06%
Formula
Percentage change = [(570 - 815) / 815] x 100
Subtract the new number by the original number
570 - 815 = -245
-245 ÷ 815 = -0.3006134969325153
-0.3006134969325153 x 100 = -30.06%