3.72% is the change from 511 to 530
Calculation steps:
[( 530 - 511 ) ÷ 511] x 100 = 3.72%
Formula
Percentage change = [(530 - 511) / 511] x 100
Subtract the new number by the original number
530 - 511 = 19
19 ÷ 511 = 0.03718199608610567
0.03718199608610567 x 100 = 3.72%