8.77% is the change from 171 to 186
Calculation steps:
[( 186 - 171 ) ÷ 171] x 100 = 8.77%
Formula
Percentage change = [(186 - 171) / 171] x 100
Subtract the new number by the original number
186 - 171 = 15
15 ÷ 171 = 0.08771929824561403
0.08771929824561403 x 100 = 8.77%