For 2005 a 2-piece fold down set was offered AND a fix set having just the folding center section. Fold was appears standard on LE and XLE, perhaps the CE does not have this.
The 2006 should be the same. There was a model change for 2007, I don't know about this year. A Google search will turn up car reviews with the info.
Note: The Hybrid appears to have a differant seat layout, only one side of the back seat folds down.