-99.88% is the change from 815 to 1
Calculation steps:
[( 1 - 815 ) ÷ 815] x 100 = -99.88%
Formula
Percentage change = [(1 - 815) / 815] x 100
Subtract the new number by the original number
1 - 815 = -814
-814 ÷ 815 = -0.9987730061349693
-0.9987730061349693 x 100 = -99.88%