-99.5% is the change from 803 to 4
Calculation steps:
[( 4 - 803 ) ÷ 803] x 100 = -99.5%
Formula
Percentage change = [(4 - 803) / 803] x 100
Subtract the new number by the original number
4 - 803 = -799
-799 ÷ 803 = -0.9950186799501868
-0.9950186799501868 x 100 = -99.5%