6.38% is the change from 643 to 684
Calculation steps:
[( 684 - 643 ) ÷ 643] x 100 = 6.38%
Formula
Percentage change = [(684 - 643) / 643] x 100
Subtract the new number by the original number
684 - 643 = 41
41 ÷ 643 = 0.06376360808709176
0.06376360808709176 x 100 = 6.38%