-96.1% is the change from 231 to 9
Calculation steps:
[( 9 - 231 ) ÷ 231] x 100 = -96.1%
Formula
Percentage change = [(9 - 231) / 231] x 100
Subtract the new number by the original number
9 - 231 = -222
-222 ÷ 231 = -0.961038961038961
-0.961038961038961 x 100 = -96.1%