1.77% is the change from 509 to 518
Calculation steps:
[( 518 - 509 ) ÷ 509] x 100 = 1.77%
Formula
Percentage change = [(518 - 509) / 509] x 100
Subtract the new number by the original number
518 - 509 = 9
9 ÷ 509 = 0.01768172888015717
0.01768172888015717 x 100 = 1.77%