-28.87% is the change from 821 to 584
Calculation steps:
[( 584 - 821 ) ÷ 821] x 100 = -28.87%
Formula
Percentage change = [(584 - 821) / 821] x 100
Subtract the new number by the original number
584 - 821 = -237
-237 ÷ 821 = -0.28867235079171744
-0.28867235079171744 x 100 = -28.87%