6.37% is the change from 628 to 668
Calculation steps:
[( 668 - 628 ) ÷ 628] x 100 = 6.37%
Formula
Percentage change = [(668 - 628) / 628] x 100
Subtract the new number by the original number
668 - 628 = 40
40 ÷ 628 = 0.06369426751592357
0.06369426751592357 x 100 = 6.37%