20.24% is the change from 509 to 612
Calculation steps:
[( 612 - 509 ) ÷ 509] x 100 = 20.24%
Formula
Percentage change = [(612 - 509) / 509] x 100
Subtract the new number by the original number
612 - 509 = 103
103 ÷ 509 = 0.20235756385068762
0.20235756385068762 x 100 = 20.24%