-99.88% is the change from 819 to 1
Calculation steps:
[( 1 - 819 ) ÷ 819] x 100 = -99.88%
Formula
Percentage change = [(1 - 819) / 819] x 100
Subtract the new number by the original number
1 - 819 = -818
-818 ÷ 819 = -0.9987789987789988
-0.9987789987789988 x 100 = -99.88%