-89.16% is the change from 166 to 18
Calculation steps:
[( 18 - 166 ) ÷ 166] x 100 = -89.16%
Formula
Percentage change = [(18 - 166) / 166] x 100
Subtract the new number by the original number
18 - 166 = -148
-148 ÷ 166 = -0.891566265060241
-0.891566265060241 x 100 = -89.16%