-97.66% is the change from 813 to 19
Calculation steps:
[( 19 - 813 ) ÷ 813] x 100 = -97.66%
Formula
Percentage change = [(19 - 813) / 813] x 100
Subtract the new number by the original number
19 - 813 = -794
-794 ÷ 813 = -0.976629766297663
-0.976629766297663 x 100 = -97.66%