-96.44% is the change from 871 to 31
Calculation steps:
[( 31 - 871 ) ÷ 871] x 100 = -96.44%
Formula
Percentage change = [(31 - 871) / 871] x 100
Subtract the new number by the original number
31 - 871 = -840
-840 ÷ 871 = -0.9644087256027555
-0.9644087256027555 x 100 = -96.44%