-96.41% is the change from 585 to 21
Calculation steps:
[( 21 - 585 ) ÷ 585] x 100 = -96.41%
Formula
Percentage change = [(21 - 585) / 585] x 100
Subtract the new number by the original number
21 - 585 = -564
-564 ÷ 585 = -0.9641025641025641
-0.9641025641025641 x 100 = -96.41%