-99.8% is the change from 489 to 1
Calculation steps:
[( 1 - 489 ) ÷ 489] x 100 = -99.8%
Formula
Percentage change = [(1 - 489) / 489] x 100
Subtract the new number by the original number
1 - 489 = -488
-488 ÷ 489 = -0.9979550102249489
-0.9979550102249489 x 100 = -99.8%