-89.01% is the change from 828 to 91
Calculation steps:
[( 91 - 828 ) ÷ 828] x 100 = -89.01%
Formula
Percentage change = [(91 - 828) / 828] x 100
Subtract the new number by the original number
91 - 828 = -737
-737 ÷ 828 = -0.8900966183574879
-0.8900966183574879 x 100 = -89.01%