0.63% is the change from 639 to 643
Calculation steps:
[( 643 - 639 ) ÷ 639] x 100 = 0.63%
Formula
Percentage change = [(643 - 639) / 639] x 100
Subtract the new number by the original number
643 - 639 = 4
4 ÷ 639 = 0.006259780907668232
0.006259780907668232 x 100 = 0.63%