19.11% is the change from 539 to 642
Calculation steps:
[( 642 - 539 ) ÷ 539] x 100 = 19.11%
Formula
Percentage change = [(642 - 539) / 539] x 100
Subtract the new number by the original number
642 - 539 = 103
103 ÷ 539 = 0.19109461966604824
0.19109461966604824 x 100 = 19.11%