I don't think we know and given the lag in reading for some people. Here's some raw numbers. It looks like the overall percentage of participation (number of people commenting [users] against the number of votes a winner received [votes] is better for the literary club). In total participation seems to be almost 100%.
Code:
Regular
Month Category Title Votes Comments Users
----- -------- -------------------------------------- ----- -------- -----
Jan RunnerUps The Hitchhiker's Guide to the Galaxy 21 89 39
Feb Romance A Room with a View 21 34 17
Mar NonFiction The Autobiography of Benjamin Franklin 15 25 11
Apr Humour Hal Spacejock #1 14 51 18
May Classic Anna Karenina 23 34 16
Jun Thriller The Maltese Falcon 19 50 16
Jul Fantasy The Name of the Wind 17 44 22
Aug FreeForAll Slaughterhouse Five 22 27 16
Sep Mystery The Chinese Maze Murders 21 11 4
Literary
Month Category Title Votes Comments Users
----- ------------------ ------------------------ ----- -------- -----
Jun FreeForAll The Master and Margarita 14 87 18
Jul Highly Challenging Bleak House 14 39 11
Aug Lottery A Passage to India 0 30 9
Sep Non-Fiction Unbroken 6 6 6
I'm really surprised that we've only had four people involved in the Regular Book Club for September. Sure it's early, but four people? For one of the more popular genre's around. Even if I never venture down the mystery aisle at the bookstore, I read this one and am participating in the discussion.