-97.28% is the change from 331 to 9
Calculation steps:
[( 9 - 331 ) ÷ 331] x 100 = -97.28%
Formula
Percentage change = [(9 - 331) / 331] x 100
Subtract the new number by the original number
9 - 331 = -322
-322 ÷ 331 = -0.972809667673716
-0.972809667673716 x 100 = -97.28%