-99.88% is the change from 851 to 1
Calculation steps:
[( 1 - 851 ) ÷ 851] x 100 = -99.88%
Formula
Percentage change = [(1 - 851) / 851] x 100
Subtract the new number by the original number
1 - 851 = -850
-850 ÷ 851 = -0.9988249118683902
-0.9988249118683902 x 100 = -99.88%