-99.07% is the change from 856 to 8
Calculation steps:
[( 8 - 856 ) ÷ 856] x 100 = -99.07%
Formula
Percentage change = [(8 - 856) / 856] x 100
Subtract the new number by the original number
8 - 856 = -848
-848 ÷ 856 = -0.9906542056074766
-0.9906542056074766 x 100 = -99.07%