15.14% is the change from 555 to 639
Calculation steps:
[( 639 - 555 ) ÷ 555] x 100 = 15.14%
Formula
Percentage change = [(639 - 555) / 555] x 100
Subtract the new number by the original number
639 - 555 = 84
84 ÷ 555 = 0.15135135135135136
0.15135135135135136 x 100 = 15.14%