-81.65% is the change from 496 to 91
Calculation steps:
[( 91 - 496 ) ÷ 496] x 100 = -81.65%
Formula
Percentage change = [(91 - 496) / 496] x 100
Subtract the new number by the original number
91 - 496 = -405
-405 ÷ 496 = -0.8165322580645161
-0.8165322580645161 x 100 = -81.65%