-96.38% is the change from 857 to 31
Calculation steps:
[( 31 - 857 ) ÷ 857] x 100 = -96.38%
Formula
Percentage change = [(31 - 857) / 857] x 100
Subtract the new number by the original number
31 - 857 = -826
-826 ÷ 857 = -0.9638273045507585
-0.9638273045507585 x 100 = -96.38%