-58.24% is the change from 170 to 71
Calculation steps:
[( 71 - 170 ) ÷ 170] x 100 = -58.24%
Formula
Percentage change = [(71 - 170) / 170] x 100
Subtract the new number by the original number
71 - 170 = -99
-99 ÷ 170 = -0.5823529411764706
-0.5823529411764706 x 100 = -58.24%