-99.88% is the change from 809 to 1
Calculation steps:
[( 1 - 809 ) ÷ 809] x 100 = -99.88%
Formula
Percentage change = [(1 - 809) / 809] x 100
Subtract the new number by the original number
1 - 809 = -808
-808 ÷ 809 = -0.9987639060568603
-0.9987639060568603 x 100 = -99.88%