-99.5% is the change from 797 to 4
Calculation steps:
[( 4 - 797 ) ÷ 797] x 100 = -99.5%
Formula
Percentage change = [(4 - 797) / 797] x 100
Subtract the new number by the original number
4 - 797 = -793
-793 ÷ 797 = -0.9949811794228356
-0.9949811794228356 x 100 = -99.5%