19.52% is the change from 538 to 643
Calculation steps:
[( 643 - 538 ) ÷ 538] x 100 = 19.52%
Formula
Percentage change = [(643 - 538) / 538] x 100
Subtract the new number by the original number
643 - 538 = 105
105 ÷ 538 = 0.19516728624535315
0.19516728624535315 x 100 = 19.52%