-96.36% is the change from 577 to 21
Calculation steps:
[( 21 - 577 ) ÷ 577] x 100 = -96.36%
Formula
Percentage change = [(21 - 577) / 577] x 100
Subtract the new number by the original number
21 - 577 = -556
-556 ÷ 577 = -0.9636048526863085
-0.9636048526863085 x 100 = -96.36%