2.42% is the change from 621 to 636
Calculation steps:
[( 636 - 621 ) ÷ 621] x 100 = 2.42%
Formula
Percentage change = [(636 - 621) / 621] x 100
Subtract the new number by the original number
636 - 621 = 15
15 ÷ 621 = 0.024154589371980676
0.024154589371980676 x 100 = 2.42%