7.2% is the change from 639 to 685
Calculation steps:
[( 685 - 639 ) ÷ 639] x 100 = 7.2%
Formula
Percentage change = [(685 - 639) / 639] x 100
Subtract the new number by the original number
685 - 639 = 46
46 ÷ 639 = 0.07198748043818466
0.07198748043818466 x 100 = 7.2%