-86.27% is the change from 590 to 81
Calculation steps:
[( 81 - 590 ) ÷ 590] x 100 = -86.27%
Formula
Percentage change = [(81 - 590) / 590] x 100
Subtract the new number by the original number
81 - 590 = -509
-509 ÷ 590 = -0.8627118644067797
-0.8627118644067797 x 100 = -86.27%