-50.3% is the change from 988 to 491
Calculation steps:
[( 491 - 988 ) ÷ 988] x 100 = -50.3%
Formula
Percentage change = [(491 - 988) / 988] x 100
Subtract the new number by the original number
491 - 988 = -497
-497 ÷ 988 = -0.5030364372469636
-0.5030364372469636 x 100 = -50.3%