3.17% is the change from 631 to 651
Calculation steps:
[( 651 - 631 ) ÷ 631] x 100 = 3.17%
Formula
Percentage change = [(651 - 631) / 631] x 100
Subtract the new number by the original number
651 - 631 = 20
20 ÷ 631 = 0.03169572107765452
0.03169572107765452 x 100 = 3.17%