7.67% is the change from 639 to 688
Calculation steps:
[( 688 - 639 ) ÷ 639] x 100 = 7.67%
Formula
Percentage change = [(688 - 639) / 639] x 100
Subtract the new number by the original number
688 - 639 = 49
49 ÷ 639 = 0.07668231611893583
0.07668231611893583 x 100 = 7.67%