-99.51% is the change from 816 to 4
Calculation steps:
[( 4 - 816 ) ÷ 816] x 100 = -99.51%
Formula
Percentage change = [(4 - 816) / 816] x 100
Subtract the new number by the original number
4 - 816 = -812
-812 ÷ 816 = -0.9950980392156863
-0.9950980392156863 x 100 = -99.51%