Industry Statistics for 2006

I found some interesting industry statistics on the Romance Writers of America website. To quote a portion of the article:

Simba Information reports U.S. book sales (net revenue from retail sources) at $6.31 billion for 2006...

• Romance: $1.37 billion
• Religion/inspirational: $1.68 billion
• Science fiction/fantasy: $495 million
• Classic literary fiction: $448 million
• Mystery: $422 million
• Graphic novels: $128 million

I thought it was interesting to see what books people are spending their money on.