9.09% is the change from 66 to 72
Calculation steps:
[( 72 - 66 ) ÷ 66] x 100 = 9.09%
Formula
Percentage change = [(72 - 66) / 66] x 100
Subtract the new number by the original number
72 - 66 = 6
6 ÷ 66 = 0.09090909090909091
0.09090909090909091 x 100 = 9.09%