-98.41% is the change from 819 to 13
Calculation steps:
[( 13 - 819 ) ÷ 819] x 100 = -98.41%
Formula
Percentage change = [(13 - 819) / 819] x 100
Subtract the new number by the original number
13 - 819 = -806
-806 ÷ 819 = -0.9841269841269841
-0.9841269841269841 x 100 = -98.41%