1.81% is the change from 609 to 620
Calculation steps:
[( 620 - 609 ) ÷ 609] x 100 = 1.81%
Formula
Percentage change = [(620 - 609) / 609] x 100
Subtract the new number by the original number
620 - 609 = 11
11 ÷ 609 = 0.0180623973727422
0.0180623973727422 x 100 = 1.81%