4.75% is the change from 610 to 639
Calculation steps:
[( 639 - 610 ) ÷ 610] x 100 = 4.75%
Formula
Percentage change = [(639 - 610) / 610] x 100
Subtract the new number by the original number
639 - 610 = 29
29 ÷ 610 = 0.047540983606557376
0.047540983606557376 x 100 = 4.75%