-11.18% is the change from 170 to 151
Calculation steps:
[( 151 - 170 ) ÷ 170] x 100 = -11.18%
Formula
Percentage change = [(151 - 170) / 170] x 100
Subtract the new number by the original number
151 - 170 = -19
-19 ÷ 170 = -0.11176470588235295
-0.11176470588235295 x 100 = -11.18%