-9.39% is the change from 181 to 164
Calculation steps:
[( 164 - 181 ) ÷ 181] x 100 = -9.39%
Formula
Percentage change = [(164 - 181) / 181] x 100
Subtract the new number by the original number
164 - 181 = -17
-17 ÷ 181 = -0.09392265193370165
-0.09392265193370165 x 100 = -9.39%