-50.7% is the change from 996 to 491
Calculation steps:
[( 491 - 996 ) ÷ 996] x 100 = -50.7%
Formula
Percentage change = [(491 - 996) / 996] x 100
Subtract the new number by the original number
491 - 996 = -505
-505 ÷ 996 = -0.5070281124497992
-0.5070281124497992 x 100 = -50.7%