-97.69% is the change from 823 to 19
Calculation steps:
[( 19 - 823 ) ÷ 823] x 100 = -97.69%
Formula
Percentage change = [(19 - 823) / 823] x 100
Subtract the new number by the original number
19 - 823 = -804
-804 ÷ 823 = -0.976913730255164
-0.976913730255164 x 100 = -97.69%