The most read books in the world

Some surprises here.  I love Twilight as much as the next thirty-year-old woman who feels a connection with her 14-year-old inner nerd, but I don't know that it deserves a spot in the top ten.  Perhaps the books that come in a series were each counted as a single work?

(Graph by Jared Fanning, available here, via swissmiss.)