-50.35% is the change from 989 to 491
Calculation steps:
[( 491 - 989 ) ÷ 989] x 100 = -50.35%
Formula
Percentage change = [(491 - 989) / 989] x 100
Subtract the new number by the original number
491 - 989 = -498
-498 ÷ 989 = -0.5035389282103134
-0.5035389282103134 x 100 = -50.35%