Like I said in the other thread you posted that data in, I agree that yoy has stayed relatively flat.
I still think that what is interesting in the data you are citing is that last year at this point inventory was falling, this year it is still going up. What happens next month will be interesting – if inventory stays level or increases, the yoy comparison will start changing in a hurry. I do think it is an artifact of the decreasing sales, like you said.