-97.69% is the change from 821 to 19
Calculation steps:
[( 19 - 821 ) ÷ 821] x 100 = -97.69%
Formula
Percentage change = [(19 - 821) / 821] x 100
Subtract the new number by the original number
19 - 821 = -802
-802 ÷ 821 = -0.976857490864799
-0.976857490864799 x 100 = -97.69%