19.7% is the change from 66 to 79
Calculation steps:
[( 79 - 66 ) ÷ 66] x 100 = 19.7%
Formula
Percentage change = [(79 - 66) / 66] x 100
Subtract the new number by the original number
79 - 66 = 13
13 ÷ 66 = 0.19696969696969696
0.19696969696969696 x 100 = 19.7%