-28.1% is the change from 815 to 586
Calculation steps:
[( 586 - 815 ) ÷ 815] x 100 = -28.1%
Formula
Percentage change = [(586 - 815) / 815] x 100
Subtract the new number by the original number
586 - 815 = -229
-229 ÷ 815 = -0.2809815950920245
-0.2809815950920245 x 100 = -28.1%