-50.2% is the change from 998 to 497
Calculation steps:
[( 497 - 998 ) ÷ 998] x 100 = -50.2%
Formula
Percentage change = [(497 - 998) / 998] x 100
Subtract the new number by the original number
497 - 998 = -501
-501 ÷ 998 = -0.5020040080160321
-0.5020040080160321 x 100 = -50.2%