21.39% is the change from 664 to 806
Calculation steps:
[( 806 - 664 ) ÷ 664] x 100 = 21.39%
Formula
Percentage change = [(806 - 664) / 664] x 100
Subtract the new number by the original number
806 - 664 = 142
142 ÷ 664 = 0.21385542168674698
0.21385542168674698 x 100 = 21.39%