-10.17% is the change from 580 to 521
Calculation steps:
[( 521 - 580 ) ÷ 580] x 100 = -10.17%
Formula
Percentage change = [(521 - 580) / 580] x 100
Subtract the new number by the original number
521 - 580 = -59
-59 ÷ 580 = -0.10172413793103448
-0.10172413793103448 x 100 = -10.17%