-86.06% is the change from 581 to 81
Calculation steps:
[( 81 - 581 ) ÷ 581] x 100 = -86.06%
Formula
Percentage change = [(81 - 581) / 581] x 100
Subtract the new number by the original number
81 - 581 = -500
-500 ÷ 581 = -0.8605851979345955
-0.8605851979345955 x 100 = -86.06%