-1.18% is the change from 170 to 168
Calculation steps:
[( 168 - 170 ) ÷ 170] x 100 = -1.18%
Formula
Percentage change = [(168 - 170) / 170] x 100
Subtract the new number by the original number
168 - 170 = -2
-2 ÷ 170 = -0.011764705882352941
-0.011764705882352941 x 100 = -1.18%