3.13% is the change from 638 to 658
Calculation steps:
[( 658 - 638 ) ÷ 638] x 100 = 3.13%
Formula
Percentage change = [(658 - 638) / 638] x 100
Subtract the new number by the original number
658 - 638 = 20
20 ÷ 638 = 0.03134796238244514
0.03134796238244514 x 100 = 3.13%