-50.5% is the change from 998 to 494
Calculation steps:
[( 494 - 998 ) ÷ 998] x 100 = -50.5%
Formula
Percentage change = [(494 - 998) / 998] x 100
Subtract the new number by the original number
494 - 998 = -504
-504 ÷ 998 = -0.5050100200400801
-0.5050100200400801 x 100 = -50.5%