7.36% is the change from 639 to 686
Calculation steps:
[( 686 - 639 ) ÷ 639] x 100 = 7.36%
Formula
Percentage change = [(686 - 639) / 639] x 100
Subtract the new number by the original number
686 - 639 = 47
47 ÷ 639 = 0.07355242566510173
0.07355242566510173 x 100 = 7.36%