-96.21% is the change from 817 to 31
Calculation steps:
[( 31 - 817 ) ÷ 817] x 100 = -96.21%
Formula
Percentage change = [(31 - 817) / 817] x 100
Subtract the new number by the original number
31 - 817 = -786
-786 ÷ 817 = -0.9620563035495716
-0.9620563035495716 x 100 = -96.21%