15.43% is the change from 538 to 621
Calculation steps:
[( 621 - 538 ) ÷ 538] x 100 = 15.43%
Formula
Percentage change = [(621 - 538) / 538] x 100
Subtract the new number by the original number
621 - 538 = 83
83 ÷ 538 = 0.15427509293680297
0.15427509293680297 x 100 = 15.43%