-98.59% is the change from 851 to 12
Calculation steps:
[( 12 - 851 ) ÷ 851] x 100 = -98.59%
Formula
Percentage change = [(12 - 851) / 851] x 100
Subtract the new number by the original number
12 - 851 = -839
-839 ÷ 851 = -0.9858989424206815
-0.9858989424206815 x 100 = -98.59%