Oh, I'm in year 3 and 4 for mine - I hope they don't go downhill! I don't do anything with mine so I wouldn't be surprised if they do - but for comparison, Karen, do you put aged manure around them or make sure they're watered in the summer when they're setting buds or otherwise fertilize, etc? Oh I did mix in aged manure in the hole, below the roots, when I planted them. We're in similar locations so I'm curious.
I've loved them so far because they've thrived with neglect. They do get a solid 6 hours of sun, though, so maybe that's helped them.