-25.97% is the change from 231 to 171
Calculation steps:
[( 171 - 231 ) ÷ 231] x 100 = -25.97%
Formula
Percentage change = [(171 - 231) / 231] x 100
Subtract the new number by the original number
171 - 231 = -60
-60 ÷ 231 = -0.2597402597402597
-0.2597402597402597 x 100 = -25.97%