-96.21% is the change from 818 to 31
Calculation steps:
[( 31 - 818 ) ÷ 818] x 100 = -96.21%
Formula
Percentage change = [(31 - 818) / 818] x 100
Subtract the new number by the original number
31 - 818 = -787
-787 ÷ 818 = -0.9621026894865525
-0.9621026894865525 x 100 = -96.21%