-95.38% is the change from 671 to 31
Calculation steps:
[( 31 - 671 ) ÷ 671] x 100 = -95.38%
Formula
Percentage change = [(31 - 671) / 671] x 100
Subtract the new number by the original number
31 - 671 = -640
-640 ÷ 671 = -0.9538002980625931
-0.9538002980625931 x 100 = -95.38%