-96.37% is the change from 855 to 31
Calculation steps:
[( 31 - 855 ) ÷ 855] x 100 = -96.37%
Formula
Percentage change = [(31 - 855) / 855] x 100
Subtract the new number by the original number
31 - 855 = -824
-824 ÷ 855 = -0.9637426900584796
-0.9637426900584796 x 100 = -96.37%