-10.67% is the change from 815 to 728
Calculation steps:
[( 728 - 815 ) ÷ 815] x 100 = -10.67%
Formula
Percentage change = [(728 - 815) / 815] x 100
Subtract the new number by the original number
728 - 815 = -87
-87 ÷ 815 = -0.1067484662576687
-0.1067484662576687 x 100 = -10.67%