-96.07% is the change from 331 to 13
Calculation steps:
[( 13 - 331 ) ÷ 331] x 100 = -96.07%
Formula
Percentage change = [(13 - 331) / 331] x 100
Subtract the new number by the original number
13 - 331 = -318
-318 ÷ 331 = -0.9607250755287009
-0.9607250755287009 x 100 = -96.07%