-98.39% is the change from 809 to 13
Calculation steps:
[( 13 - 809 ) ÷ 809] x 100 = -98.39%
Formula
Percentage change = [(13 - 809) / 809] x 100
Subtract the new number by the original number
13 - 809 = -796
-796 ÷ 809 = -0.9839307787391842
-0.9839307787391842 x 100 = -98.39%