I bought my land a couple of years ago because a friend said she wanted to rent something different than where she already was. After I bought it, she decided it wasn't what she wanted and rented elsewhere, sticking me with a chunk of land I didn't really want to begin with. So I thought I'd just put it up for rent and find someone else, only nobody did. Even the guy next to me couldn't rent his identical plot for 100L a week.
So unless I'm just terrible at this whole real estate thing, I'd say it's been on a slow constant downhill slide for a while.