-86.58% is the change from 231 to 31
Calculation steps:
[( 31 - 231 ) ÷ 231] x 100 = -86.58%
Formula
Percentage change = [(31 - 231) / 231] x 100
Subtract the new number by the original number
31 - 231 = -200
-200 ÷ 231 = -0.8658008658008658
-0.8658008658008658 x 100 = -86.58%