I see your vehicle is a 2003 Limited. Mine is also the same model and year.
I find the rear washer does not work as well as I would like it to but mine also comes out in a small stream, not a spray. I find the wiper is not very effective more so than the washer. Mine has acted like that since I picked my truck up from the dealer, so to me, that is normal.
On the other hand, if yours used to spray out and now it comes out in a small stream, then that would be abnormal.
-Toy-Man-