I had a 2000 Grand Am when I rented in December 1999, had about 1,000 miles on it. I had a 2001 Camry last December, had 200 miles on it. So they should have some 2002 this December. I think they get a steady supply of new cars, I had a Lumina (not sure of the year, probably 2001) with about 1,000 miles this past May.
Mid August we were told that the reason the garage and EA were so empty was because they took the old cars out and were in the process of getting new cars into the inventory. We got a Blazer with 6 miles in it!