-96.32% is the change from 571 to 21
Calculation steps:
[( 21 - 571 ) ÷ 571] x 100 = -96.32%
Formula
Percentage change = [(21 - 571) / 571] x 100
Subtract the new number by the original number
21 - 571 = -550
-550 ÷ 571 = -0.9632224168126094
-0.9632224168126094 x 100 = -96.32%