-50.9% is the change from 996 to 489
Calculation steps:
[( 489 - 996 ) ÷ 996] x 100 = -50.9%
Formula
Percentage change = [(489 - 996) / 996] x 100
Subtract the new number by the original number
489 - 996 = -507
-507 ÷ 996 = -0.5090361445783133
-0.5090361445783133 x 100 = -50.9%