NADAGuides.com has your unit listed, spec it out and see. I didn't know about your specific unit and prices came back from $72k to $57k.
Generally most say 25-30% depreciation off the lot then 10% per year after.
Key is to know what you paid, what you owe (assuming you have a loan) and then compare the dealers numbers. I traded our 2005 Raptor a year later after buying it and did pretty good. The Toy Hauler lines were really taking off about then and dealer couldn't keep them in stock. They were able take mine in on trade and have it out the door 2 days later, thus no flooring costs so the deal I got was pretty good.