21.65% is the change from 665 to 809
Calculation steps:
[( 809 - 665 ) ÷ 665] x 100 = 21.65%
Formula
Percentage change = [(809 - 665) / 665] x 100
Subtract the new number by the original number
809 - 665 = 144
144 ÷ 665 = 0.21654135338345865
0.21654135338345865 x 100 = 21.65%