21.02% is the change from 528 to 639
Calculation steps:
[( 639 - 528 ) ÷ 528] x 100 = 21.02%
Formula
Percentage change = [(639 - 528) / 528] x 100
Subtract the new number by the original number
639 - 528 = 111
111 ÷ 528 = 0.21022727272727273
0.21022727272727273 x 100 = 21.02%