-99.02% is the change from 819 to 8
Calculation steps:
[( 8 - 819 ) ÷ 819] x 100 = -99.02%
Formula
Percentage change = [(8 - 819) / 819] x 100
Subtract the new number by the original number
8 - 819 = -811
-811 ÷ 819 = -0.9902319902319903
-0.9902319902319903 x 100 = -99.02%