-99.5% is the change from 805 to 4
Calculation steps:
[( 4 - 805 ) ÷ 805] x 100 = -99.5%
Formula
Percentage change = [(4 - 805) / 805] x 100
Subtract the new number by the original number
4 - 805 = -801
-801 ÷ 805 = -0.9950310559006211
-0.9950310559006211 x 100 = -99.5%