-99.5% is the change from 806 to 4
Calculation steps:
[( 4 - 806 ) ÷ 806] x 100 = -99.5%
Formula
Percentage change = [(4 - 806) / 806] x 100
Subtract the new number by the original number
4 - 806 = -802
-802 ÷ 806 = -0.9950372208436724
-0.9950372208436724 x 100 = -99.5%