-96.68% is the change from 391 to 13
Calculation steps:
[( 13 - 391 ) ÷ 391] x 100 = -96.68%
Formula
Percentage change = [(13 - 391) / 391] x 100
Subtract the new number by the original number
13 - 391 = -378
-378 ÷ 391 = -0.9667519181585678
-0.9667519181585678 x 100 = -96.68%