0.5% is the change from 606 to 609
Calculation steps:
[( 609 - 606 ) ÷ 606] x 100 = 0.5%
Formula
Percentage change = [(609 - 606) / 606] x 100
Subtract the new number by the original number
609 - 606 = 3
3 ÷ 606 = 0.0049504950495049506
0.0049504950495049506 x 100 = 0.5%