22.65% is the change from 521 to 639
Calculation steps:
[( 639 - 521 ) ÷ 521] x 100 = 22.65%
Formula
Percentage change = [(639 - 521) / 521] x 100
Subtract the new number by the original number
639 - 521 = 118
118 ÷ 521 = 0.22648752399232247
0.22648752399232247 x 100 = 22.65%