3.05% is the change from 591 to 609
Calculation steps:
[( 609 - 591 ) ÷ 591] x 100 = 3.05%
Formula
Percentage change = [(609 - 591) / 591] x 100
Subtract the new number by the original number
609 - 591 = 18
18 ÷ 591 = 0.030456852791878174
0.030456852791878174 x 100 = 3.05%