-48.8% is the change from 166 to 85
Calculation steps:
[( 85 - 166 ) ÷ 166] x 100 = -48.8%
Formula
Percentage change = [(85 - 166) / 166] x 100
Subtract the new number by the original number
85 - 166 = -81
-81 ÷ 166 = -0.4879518072289157
-0.4879518072289157 x 100 = -48.8%