3.61% is the change from 609 to 631
Calculation steps:
[( 631 - 609 ) ÷ 609] x 100 = 3.61%
Formula
Percentage change = [(631 - 609) / 609] x 100
Subtract the new number by the original number
631 - 609 = 22
22 ÷ 609 = 0.0361247947454844
0.0361247947454844 x 100 = 3.61%