-98.47% is the change from 851 to 13
Calculation steps:
[( 13 - 851 ) ÷ 851] x 100 = -98.47%
Formula
Percentage change = [(13 - 851) / 851] x 100
Subtract the new number by the original number
13 - 851 = -838
-838 ÷ 851 = -0.9847238542890717
-0.9847238542890717 x 100 = -98.47%