3.34% is the change from 539 to 557
Calculation steps:
[( 557 - 539 ) ÷ 539] x 100 = 3.34%
Formula
Percentage change = [(557 - 539) / 539] x 100
Subtract the new number by the original number
557 - 539 = 18
18 ÷ 539 = 0.03339517625231911
0.03339517625231911 x 100 = 3.34%