-29.11% is the change from 821 to 582
Calculation steps:
[( 582 - 821 ) ÷ 821] x 100 = -29.11%
Formula
Percentage change = [(582 - 821) / 821] x 100
Subtract the new number by the original number
582 - 821 = -239
-239 ÷ 821 = -0.2911084043848965
-0.2911084043848965 x 100 = -29.11%