-29.23% is the change from 821 to 581
Calculation steps:
[( 581 - 821 ) ÷ 821] x 100 = -29.23%
Formula
Percentage change = [(581 - 821) / 821] x 100
Subtract the new number by the original number
581 - 821 = -240
-240 ÷ 821 = -0.292326431181486
-0.292326431181486 x 100 = -29.23%