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UNIT SHARE OF ADULT BOOKS SOLD BY SELECT GENRES[*]
PERCENTAGE
1999 2001 POINT CHANGE
General fiction 6.4% 10.0% +3.6
Mystery/thriller 13.8% 15.0% +1.2
General nonfiction 0.9% 1.3% +0.4
Religious 13.0% 13.5% +0.5
History 2.3% 2.4% +0.1
Biography/autobiography 3.1% 3.0% -0.1
Cooking 3.7% 3.5% -0.2
Romance 20.7% 20.0% -0.7
Self-help 5.2% 4.4% -0.8
Science fiction 6.5% 5.5% -1.0
Business 5.8% 4.2% -1.6
[*] Numbers do not add to 100 because no all genres are listed.

Note that sales of political non fiction books is minuscule compared to any of the above mentioned market share.