-85.1% is the change from 577 to 86
Calculation steps:
[( 86 - 577 ) ÷ 577] x 100 = -85.1%
Formula
Percentage change = [(86 - 577) / 577] x 100
Subtract the new number by the original number
86 - 577 = -491
-491 ÷ 577 = -0.8509532062391681
-0.8509532062391681 x 100 = -85.1%