19.58% is the change from 521 to 623
Calculation steps:
[( 623 - 521 ) ÷ 521] x 100 = 19.58%
Formula
Percentage change = [(623 - 521) / 521] x 100
Subtract the new number by the original number
623 - 521 = 102
102 ÷ 521 = 0.19577735124760076
0.19577735124760076 x 100 = 19.58%