7.52% is the change from 638 to 686
Calculation steps:
[( 686 - 638 ) ÷ 638] x 100 = 7.52%
Formula
Percentage change = [(686 - 638) / 638] x 100
Subtract the new number by the original number
686 - 638 = 48
48 ÷ 638 = 0.07523510971786834
0.07523510971786834 x 100 = 7.52%