-99.39% is the change from 815 to 5
Calculation steps:
[( 5 - 815 ) ÷ 815] x 100 = -99.39%
Formula
Percentage change = [(5 - 815) / 815] x 100
Subtract the new number by the original number
5 - 815 = -810
-810 ÷ 815 = -0.9938650306748467
-0.9938650306748467 x 100 = -99.39%