1.61% is the change from 621 to 631
Calculation steps:
[( 631 - 621 ) ÷ 621] x 100 = 1.61%
Formula
Percentage change = [(631 - 621) / 621] x 100
Subtract the new number by the original number
631 - 621 = 10
10 ÷ 621 = 0.01610305958132045
0.01610305958132045 x 100 = 1.61%