Romance leads the pack. I think you'll find that # of sales per title are higher in the Mystery/Thriller category, but that can't compete with the sheer number of romance books published each year, approximately a gazillion.
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2010 Romance Fiction Sales in Comparison
(source: Simba Information)
Romance: $1.358 billion
Religion/inspirational: $759 million
Mystery: $682 million
Science fiction/fantasy: $559 million
Classic literary fiction: $455 million
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