Interesting poll. I have a Bachelors Degree, but if you posted this poll a month ago I would have selected High School as I just got my degree.
I personally feel a persons personality and profession has more to do with what type of reader they are. I love to read, but since going back to work (new profession, don't shoot me but as an Accountant) of late after spending all day pouring over books and papers etc I don't feel like sitting down and reading as much as I use to. The same probably goes for other office type professionals. Yet when I was in my old mind-numbing job I used to read far far more for pleasure, even whilst studying.
What I have found when it comes to readers are those that I know who have or are still in the defence force. I don't know one who doesn't read, and when I say read, I mean a book a week.