2.41% is the change from 623 to 638
Calculation steps:
[( 638 - 623 ) ÷ 623] x 100 = 2.41%
Formula
Percentage change = [(638 - 623) / 623] x 100
Subtract the new number by the original number
638 - 623 = 15
15 ÷ 623 = 0.024077046548956663
0.024077046548956663 x 100 = 2.41%