-84.4% is the change from 577 to 90
Calculation steps:
[( 90 - 577 ) ÷ 577] x 100 = -84.4%
Formula
Percentage change = [(90 - 577) / 577] x 100
Subtract the new number by the original number
90 - 577 = -487
-487 ÷ 577 = -0.8440207972270364
-0.8440207972270364 x 100 = -84.4%