6.62% is the change from 604 to 644
Calculation steps:
[( 644 - 604 ) ÷ 604] x 100 = 6.62%
Formula
Percentage change = [(644 - 604) / 604] x 100
Subtract the new number by the original number
644 - 604 = 40
40 ÷ 604 = 0.06622516556291391
0.06622516556291391 x 100 = 6.62%