30.33% is the change from 511 to 666
Calculation steps:
[( 666 - 511 ) ÷ 511] x 100 = 30.33%
Formula
Percentage change = [(666 - 511) / 511] x 100
Subtract the new number by the original number
666 - 511 = 155
155 ÷ 511 = 0.30332681017612523
0.30332681017612523 x 100 = 30.33%