23.4% is the change from 517 to 638
Calculation steps:
[( 638 - 517 ) ÷ 517] x 100 = 23.4%
Formula
Percentage change = [(638 - 517) / 517] x 100
Subtract the new number by the original number
638 - 517 = 121
121 ÷ 517 = 0.23404255319148937
0.23404255319148937 x 100 = 23.4%