-99.88% is the change from 823 to 1
Calculation steps:
[( 1 - 823 ) ÷ 823] x 100 = -99.88%
Formula
Percentage change = [(1 - 823) / 823] x 100
Subtract the new number by the original number
1 - 823 = -822
-822 ÷ 823 = -0.9987849331713244
-0.9987849331713244 x 100 = -99.88%