-98.8% is the change from 166 to 2
Calculation steps:
[( 2 - 166 ) ÷ 166] x 100 = -98.8%
Formula
Percentage change = [(2 - 166) / 166] x 100
Subtract the new number by the original number
2 - 166 = -164
-164 ÷ 166 = -0.9879518072289156
-0.9879518072289156 x 100 = -98.8%