9.62% is the change from 156 to 171
Calculation steps:
[( 171 - 156 ) ÷ 156] x 100 = 9.62%
Formula
Percentage change = [(171 - 156) / 156] x 100
Subtract the new number by the original number
171 - 156 = 15
15 ÷ 156 = 0.09615384615384616
0.09615384615384616 x 100 = 9.62%