-50.25% is the change from 997 to 496
Calculation steps:
[( 496 - 997 ) ÷ 997] x 100 = -50.25%
Formula
Percentage change = [(496 - 997) / 997] x 100
Subtract the new number by the original number
496 - 997 = -501
-501 ÷ 997 = -0.5025075225677031
-0.5025075225677031 x 100 = -50.25%