-29.15% is the change from 820 to 581
Calculation steps:
[( 581 - 820 ) ÷ 820] x 100 = -29.15%
Formula
Percentage change = [(581 - 820) / 820] x 100
Subtract the new number by the original number
581 - 820 = -239
-239 ÷ 820 = -0.2914634146341463
-0.2914634146341463 x 100 = -29.15%