-81.06% is the change from 491 to 93
Calculation steps:
[( 93 - 491 ) ÷ 491] x 100 = -81.06%
Formula
Percentage change = [(93 - 491) / 491] x 100
Subtract the new number by the original number
93 - 491 = -398
-398 ÷ 491 = -0.8105906313645621
-0.8105906313645621 x 100 = -81.06%