9.04% is the change from 166 to 181
Calculation steps:
[( 181 - 166 ) ÷ 166] x 100 = 9.04%
Formula
Percentage change = [(181 - 166) / 166] x 100
Subtract the new number by the original number
181 - 166 = 15
15 ÷ 166 = 0.09036144578313253
0.09036144578313253 x 100 = 9.04%