-98.94% is the change from 851 to 9
Calculation steps:
[( 9 - 851 ) ÷ 851] x 100 = -98.94%
Formula
Percentage change = [(9 - 851) / 851] x 100
Subtract the new number by the original number
9 - 851 = -842
-842 ÷ 851 = -0.9894242068155111
-0.9894242068155111 x 100 = -98.94%
Example