-49.5% is the change from 998 to 504
Calculation steps:
[( 504 - 998 ) ÷ 998] x 100 = -49.5%
Formula
Percentage change = [(504 - 998) / 998] x 100
Subtract the new number by the original number
504 - 998 = -494
-494 ÷ 998 = -0.49498997995991983
-0.49498997995991983 x 100 = -49.5%