-96.19% is the change from 813 to 31
Calculation steps:
[( 31 - 813 ) ÷ 813] x 100 = -96.19%
Formula
Percentage change = [(31 - 813) / 813] x 100
Subtract the new number by the original number
31 - 813 = -782
-782 ÷ 813 = -0.9618696186961869
-0.9618696186961869 x 100 = -96.19%