-30.5% is the change from 836 to 581
Calculation steps:
[( 581 - 836 ) ÷ 836] x 100 = -30.5%
Formula
Percentage change = [(581 - 836) / 836] x 100
Subtract the new number by the original number
581 - 836 = -255
-255 ÷ 836 = -0.3050239234449761
-0.3050239234449761 x 100 = -30.5%