-81.54% is the change from 493 to 91
Calculation steps:
[( 91 - 493 ) ÷ 493] x 100 = -81.54%
Formula
Percentage change = [(91 - 493) / 493] x 100
Subtract the new number by the original number
91 - 493 = -402
-402 ÷ 493 = -0.8154158215010142
-0.8154158215010142 x 100 = -81.54%