-86.2% is the change from 587 to 81
Calculation steps:
[( 81 - 587 ) ÷ 587] x 100 = -86.2%
Formula
Percentage change = [(81 - 587) / 587] x 100
Subtract the new number by the original number
81 - 587 = -506
-506 ÷ 587 = -0.8620102214650767
-0.8620102214650767 x 100 = -86.2%