18.99% is the change from 537 to 639
Calculation steps:
[( 639 - 537 ) ÷ 537] x 100 = 18.99%
Formula
Percentage change = [(639 - 537) / 537] x 100
Subtract the new number by the original number
639 - 537 = 102
102 ÷ 537 = 0.18994413407821228
0.18994413407821228 x 100 = 18.99%