-93.53% is the change from 170 to 11
Calculation steps:
[( 11 - 170 ) ÷ 170] x 100 = -93.53%
Formula
Percentage change = [(11 - 170) / 170] x 100
Subtract the new number by the original number
11 - 170 = -159
-159 ÷ 170 = -0.9352941176470588
-0.9352941176470588 x 100 = -93.53%