-96.4% is the change from 861 to 31
Calculation steps:
[( 31 - 861 ) ÷ 861] x 100 = -96.4%
Formula
Percentage change = [(31 - 861) / 861] x 100
Subtract the new number by the original number
31 - 861 = -830
-830 ÷ 861 = -0.9639953542392566
-0.9639953542392566 x 100 = -96.4%