-87.5% is the change from 728 to 91
Calculation steps:
[( 91 - 728 ) ÷ 728] x 100 = -87.5%
Formula
Percentage change = [(91 - 728) / 728] x 100
Subtract the new number by the original number
91 - 728 = -637
-637 ÷ 728 = -0.875
-0.875 x 100 = -87.5%
Example