15.99% is the change from 538 to 624
Calculation steps:
[( 624 - 538 ) ÷ 538] x 100 = 15.99%
Formula
Percentage change = [(624 - 538) / 538] x 100
Subtract the new number by the original number
624 - 538 = 86
86 ÷ 538 = 0.15985130111524162
0.15985130111524162 x 100 = 15.99%