21.53% is the change from 511 to 621
Calculation steps:
[( 621 - 511 ) ÷ 511] x 100 = 21.53%
Formula
Percentage change = [(621 - 511) / 511] x 100
Subtract the new number by the original number
621 - 511 = 110
110 ÷ 511 = 0.21526418786692758
0.21526418786692758 x 100 = 21.53%