-82.84% is the change from 577 to 99
Calculation steps:
[( 99 - 577 ) ÷ 577] x 100 = -82.84%
Formula
Percentage change = [(99 - 577) / 577] x 100
Subtract the new number by the original number
99 - 577 = -478
-478 ÷ 577 = -0.82842287694974
-0.82842287694974 x 100 = -82.84%