-96.42% is the change from 586 to 21
Calculation steps:
[( 21 - 586 ) ÷ 586] x 100 = -96.42%
Formula
Percentage change = [(21 - 586) / 586] x 100
Subtract the new number by the original number
21 - 586 = -565
-565 ÷ 586 = -0.9641638225255973
-0.9641638225255973 x 100 = -96.42%