-96.4% is the change from 584 to 21
Calculation steps:
[( 21 - 584 ) ÷ 584] x 100 = -96.4%
Formula
Percentage change = [(21 - 584) / 584] x 100
Subtract the new number by the original number
21 - 584 = -563
-563 ÷ 584 = -0.964041095890411
-0.964041095890411 x 100 = -96.4%