-2.35% is the change from 170 to 166
Calculation steps:
[( 166 - 170 ) ÷ 170] x 100 = -2.35%
Formula
Percentage change = [(166 - 170) / 170] x 100
Subtract the new number by the original number
166 - 170 = -4
-4 ÷ 170 = -0.023529411764705882
-0.023529411764705882 x 100 = -2.35%