20.92% is the change from 521 to 630
Calculation steps:
[( 630 - 521 ) ÷ 521] x 100 = 20.92%
Formula
Percentage change = [(630 - 521) / 521] x 100
Subtract the new number by the original number
630 - 521 = 109
109 ÷ 521 = 0.2092130518234165
0.2092130518234165 x 100 = 20.92%