ummm. 0 lol.
Not counted really. But mostly it would depends the schedule & mood. For one book, one day I read only a page ahead. Day after I read twenty pages straight.By this count. Each year might bring different result to the number of books per year, but maybe two-three books each year.
Kind of hard to really keep track but looking at the stack sitting on the floor by me, I would say about two books a month easily depending on the size of the book. So, a good guess would be from 20 to 25 a year and I think that's kind of low. Closer to 30 or more.
Depends in the year and how much I have going on. It has been a busy year and I haven't finished a book, but I have three going. Other years I can finish a dozen or more.