-99.27% is the change from 820 to 6
Calculation steps:
[( 6 - 820 ) ÷ 820] x 100 = -99.27%
Formula
Percentage change = [(6 - 820) / 820] x 100
Subtract the new number by the original number
6 - 820 = -814
-814 ÷ 820 = -0.9926829268292683
-0.9926829268292683 x 100 = -99.27%