7.1% is the change from 155 to 166
Calculation steps:
[( 166 - 155 ) ÷ 155] x 100 = 7.1%
Formula
Percentage change = [(166 - 155) / 155] x 100
Subtract the new number by the original number
166 - 155 = 11
11 ÷ 155 = 0.07096774193548387
0.07096774193548387 x 100 = 7.1%