-51% is the change from 998 to 489
Calculation steps:
[( 489 - 998 ) ÷ 998] x 100 = -51%
Formula
Percentage change = [(489 - 998) / 998] x 100
Subtract the new number by the original number
489 - 998 = -509
-509 ÷ 998 = -0.5100200400801603
-0.5100200400801603 x 100 = -51%