Last Year Sales with Year as Dimension

[Facundo]

Hi, I need to show Last Year Sales per Year, but I'm always end with the same result :

And I need this :

Sales :  Sum(Sales)

LY Sales :  Sum({<Year={"$(=Date(Year-1,'YYYY'))"}>} Sales)

Thanks for any advice.

[Facundo]

I figured, thanks for the answers, I will mark them as correct since they work in other versions.