30.84% is the change from 509 to 666
Calculation steps:
[( 666 - 509 ) ÷ 509] x 100 = 30.84%
Formula
Percentage change = [(666 - 509) / 509] x 100
Subtract the new number by the original number
666 - 509 = 157
157 ÷ 509 = 0.30844793713163066
0.30844793713163066 x 100 = 30.84%