-15.34% is the change from 580 to 491
Calculation steps:
[( 491 - 580 ) ÷ 580] x 100 = -15.34%
Formula
Percentage change = [(491 - 580) / 580] x 100
Subtract the new number by the original number
491 - 580 = -89
-89 ÷ 580 = -0.15344827586206897
-0.15344827586206897 x 100 = -15.34%