-50.4% is the change from 998 to 495
Calculation steps:
[( 495 - 998 ) ÷ 998] x 100 = -50.4%
Formula
Percentage change = [(495 - 998) / 998] x 100
Subtract the new number by the original number
495 - 998 = -503
-503 ÷ 998 = -0.5040080160320641
-0.5040080160320641 x 100 = -50.4%