-99.64% is the change from 823 to 3
Calculation steps:
[( 3 - 823 ) ÷ 823] x 100 = -99.64%
Formula
Percentage change = [(3 - 823) / 823] x 100
Subtract the new number by the original number
3 - 823 = -820
-820 ÷ 823 = -0.9963547995139733
-0.9963547995139733 x 100 = -99.64%