-97.68% is the change from 819 to 19
Calculation steps:
[( 19 - 819 ) ÷ 819] x 100 = -97.68%
Formula
Percentage change = [(19 - 819) / 819] x 100
Subtract the new number by the original number
19 - 819 = -800
-800 ÷ 819 = -0.9768009768009768
-0.9768009768009768 x 100 = -97.68%