2.16% is the change from 509 to 520
Calculation steps:
[( 520 - 509 ) ÷ 509] x 100 = 2.16%
Formula
Percentage change = [(520 - 509) / 509] x 100
Subtract the new number by the original number
520 - 509 = 11
11 ÷ 509 = 0.021611001964636542
0.021611001964636542 x 100 = 2.16%