-96.88% is the change from 993 to 31
Calculation steps:
[( 31 - 993 ) ÷ 993] x 100 = -96.88%
Formula
Percentage change = [(31 - 993) / 993] x 100
Subtract the new number by the original number
31 - 993 = -962
-962 ÷ 993 = -0.9687814702920443
-0.9687814702920443 x 100 = -96.88%