-85.96% is the change from 577 to 81
Calculation steps:
[( 81 - 577 ) ÷ 577] x 100 = -85.96%
Formula
Percentage change = [(81 - 577) / 577] x 100
Subtract the new number by the original number
81 - 577 = -496
-496 ÷ 577 = -0.8596187175043327
-0.8596187175043327 x 100 = -85.96%