5.91% is the change from 609 to 645
Calculation steps:
[( 645 - 609 ) ÷ 609] x 100 = 5.91%
Formula
Percentage change = [(645 - 609) / 609] x 100
Subtract the new number by the original number
645 - 609 = 36
36 ÷ 609 = 0.059113300492610835
0.059113300492610835 x 100 = 5.91%