-11.6% is the change from 181 to 160
Calculation steps:
[( 160 - 181 ) ÷ 181] x 100 = -11.6%
Formula
Percentage change = [(160 - 181) / 181] x 100
Subtract the new number by the original number
160 - 181 = -21
-21 ÷ 181 = -0.11602209944751381
-0.11602209944751381 x 100 = -11.6%