-50.8% is the change from 998 to 491
Calculation steps:
[( 491 - 998 ) ÷ 998] x 100 = -50.8%
Formula
Percentage change = [(491 - 998) / 998] x 100
Subtract the new number by the original number
491 - 998 = -507
-507 ÷ 998 = -0.5080160320641283
-0.5080160320641283 x 100 = -50.8%