1.91% is the change from 628 to 640
Calculation steps:
[( 640 - 628 ) ÷ 628] x 100 = 1.91%
Formula
Percentage change = [(640 - 628) / 628] x 100
Subtract the new number by the original number
640 - 628 = 12
12 ÷ 628 = 0.01910828025477707
0.01910828025477707 x 100 = 1.91%