13.7% is the change from 511 to 581
Calculation steps:
[( 581 - 511 ) ÷ 511] x 100 = 13.7%
Formula
Percentage change = [(581 - 511) / 511] x 100
Subtract the new number by the original number
581 - 511 = 70
70 ÷ 511 = 0.136986301369863
0.136986301369863 x 100 = 13.7%