-88.75% is the change from 809 to 91
Calculation steps:
[( 91 - 809 ) ÷ 809] x 100 = -88.75%
Formula
Percentage change = [(91 - 809) / 809] x 100
Subtract the new number by the original number
91 - 809 = -718
-718 ÷ 809 = -0.8875154511742892
-0.8875154511742892 x 100 = -88.75%