-30.62% is the change from 836 to 580
Calculation steps:
[( 580 - 836 ) ÷ 836] x 100 = -30.62%
Formula
Percentage change = [(580 - 836) / 836] x 100
Subtract the new number by the original number
580 - 836 = -256
-256 ÷ 836 = -0.3062200956937799
-0.3062200956937799 x 100 = -30.62%