-16.57% is the change from 181 to 151
Calculation steps:
[( 151 - 181 ) ÷ 181] x 100 = -16.57%
Formula
Percentage change = [(151 - 181) / 181] x 100
Subtract the new number by the original number
151 - 181 = -30
-30 ÷ 181 = -0.16574585635359115
-0.16574585635359115 x 100 = -16.57%