-1.81% is the change from 166 to 163
Calculation steps:
[( 163 - 166 ) ÷ 166] x 100 = -1.81%
Formula
Percentage change = [(163 - 166) / 166] x 100
Subtract the new number by the original number
163 - 166 = -3
-3 ÷ 166 = -0.018072289156626505
-0.018072289156626505 x 100 = -1.81%