6.36% is the change from 645 to 686
Calculation steps:
[( 686 - 645 ) ÷ 645] x 100 = 6.36%
Formula
Percentage change = [(686 - 645) / 645] x 100
Subtract the new number by the original number
686 - 645 = 41
41 ÷ 645 = 0.06356589147286822
0.06356589147286822 x 100 = 6.36%