-18.07% is the change from 166 to 136
Calculation steps:
[( 136 - 166 ) ÷ 166] x 100 = -18.07%
Formula
Percentage change = [(136 - 166) / 166] x 100
Subtract the new number by the original number
136 - 166 = -30
-30 ÷ 166 = -0.18072289156626506
-0.18072289156626506 x 100 = -18.07%