This question has two parts.  The first part is a little easier (I
think) and an answer to it would qualify as a satisfactory answer to
this question.  The second part is more difficult.  I wouldn't require
you to answer the second part but if you could I would double the
amount of I am paying in the form of a tip.

Part #1: I would like to know the breakdown of book sales between
fiction and non-fiction titles.  For example, in 2003, $50 billion
dollars worth of fiction titles were sold and $40 billion dollars of
non-fiction titles were sold.  Ideally I would like numbers going back
a few years to help determine if there were any trends.  And I would
like the numbers to be as current as possible (at least as recent as
2000).

Part #2: Essentially the same question as above, only for the spoken
word audio market (audiobooks, audio courses, etc.).  I'm looking for
the breakdown between fiction and non-fiction and the total size of
the market.  Again, a few years worth of numbers would be great and
recent numbers would be cool too.

Please let me know if you have any questions or require any further clarification.