2.94% is the change from 613 to 631
Calculation steps:
[( 631 - 613 ) ÷ 613] x 100 = 2.94%
Formula
Percentage change = [(631 - 613) / 613] x 100
Subtract the new number by the original number
631 - 613 = 18
18 ÷ 613 = 0.02936378466557912
0.02936378466557912 x 100 = 2.94%