21.71% is the change from 525 to 639
Calculation steps:
[( 639 - 525 ) ÷ 525] x 100 = 21.71%
Formula
Percentage change = [(639 - 525) / 525] x 100
Subtract the new number by the original number
639 - 525 = 114
114 ÷ 525 = 0.21714285714285714
0.21714285714285714 x 100 = 21.71%