-93.66% is the change from 489 to 31
Calculation steps:
[( 31 - 489 ) ÷ 489] x 100 = -93.66%
Formula
Percentage change = [(31 - 489) / 489] x 100
Subtract the new number by the original number
31 - 489 = -458
-458 ÷ 489 = -0.9366053169734151
-0.9366053169734151 x 100 = -93.66%