-99.06% is the change from 851 to 8
Calculation steps:
[( 8 - 851 ) ÷ 851] x 100 = -99.06%
Formula
Percentage change = [(8 - 851) / 851] x 100
Subtract the new number by the original number
8 - 851 = -843
-843 ÷ 851 = -0.9905992949471211
-0.9905992949471211 x 100 = -99.06%