-96.2% is the change from 816 to 31
Calculation steps:
[( 31 - 816 ) ÷ 816] x 100 = -96.2%
Formula
Percentage change = [(31 - 816) / 816] x 100
Subtract the new number by the original number
31 - 816 = -785
-785 ÷ 816 = -0.9620098039215687
-0.9620098039215687 x 100 = -96.2%