Unfortunately, I don't think I've read a book every year since I was young. My copy of Prisoner of Azkaban is in horrible condition because I've read it too much. Alas, I haven't reread the Potter books in quite some time.
I'm in the middle of reading The Moon is a Harsh Mistress by Robert Heinlein. It's pretty good thus far. I also really enjoyed his Stranger in a Strange Land.
I also enjoyed Stranger in a Strange Land. I have done some Potter read-aloud with my kids, but I haven't gotten back into the series myself for awhile. My younger sister reads the full series yearly though.