-86.34% is the change from 593 to 81
Calculation steps:
[( 81 - 593 ) ÷ 593] x 100 = -86.34%
Formula
Percentage change = [(81 - 593) / 593] x 100
Subtract the new number by the original number
81 - 593 = -512
-512 ÷ 593 = -0.863406408094435
-0.863406408094435 x 100 = -86.34%