I knew I wasn't like other people. I'm one of the 20%. But in college when I took a speed reading course, I was the only one in double digits when asked how many "pleasure" books you had read in the past year. I figured conservatively 50. It would have been greater without all the required reading. I think the next highest was 4.
Also I saw on "Good Morning America" where an author had written a book on how you could read 52 books a year. Go figure!