-99.15% is the change from 819 to 7
Calculation steps:
[( 7 - 819 ) ÷ 819] x 100 = -99.15%
Formula
Percentage change = [(7 - 819) / 819] x 100
Subtract the new number by the original number
7 - 819 = -812
-812 ÷ 819 = -0.9914529914529915
-0.9914529914529915 x 100 = -99.15%