-86.55% is the change from 171 to 23
Calculation steps:
[( 23 - 171 ) ÷ 171] x 100 = -86.55%
Formula
Percentage change = [(23 - 171) / 171] x 100
Subtract the new number by the original number
23 - 171 = -148
-148 ÷ 171 = -0.8654970760233918
-0.8654970760233918 x 100 = -86.55%