-12.99% is the change from 585 to 509
Calculation steps:
[( 509 - 585 ) ÷ 585] x 100 = -12.99%
Formula
Percentage change = [(509 - 585) / 585] x 100
Subtract the new number by the original number
509 - 585 = -76
-76 ÷ 585 = -0.12991452991452992
-0.12991452991452992 x 100 = -12.99%