-86.14% is the change from 166 to 23
Calculation steps:
[( 23 - 166 ) ÷ 166] x 100 = -86.14%
Formula
Percentage change = [(23 - 166) / 166] x 100
Subtract the new number by the original number
23 - 166 = -143
-143 ÷ 166 = -0.8614457831325302
-0.8614457831325302 x 100 = -86.14%