3.39% is the change from 531 to 549
Calculation steps:
[( 549 - 531 ) ÷ 531] x 100 = 3.39%
Formula
Percentage change = [(549 - 531) / 531] x 100
Subtract the new number by the original number
549 - 531 = 18
18 ÷ 531 = 0.03389830508474576
0.03389830508474576 x 100 = 3.39%