4.32% is the change from 509 to 531
Calculation steps:
[( 531 - 509 ) ÷ 509] x 100 = 4.32%
Formula
Percentage change = [(531 - 509) / 509] x 100
Subtract the new number by the original number
531 - 509 = 22
22 ÷ 509 = 0.043222003929273084
0.043222003929273084 x 100 = 4.32%