NASCAR Racing: Size of NASCAR audience at tracks, on TV, race stats, licensed products

Question
Fascinated with NASCAR's economic impact. Have seen some stats on NASCAR fan base - 75 million. Would appreciate addl info on number who attend races annually, and also on # who watch on TV. Where is info on size of attendance published on various individual races? What other info about purchases of NASCAR licensed products at races or other retail.

Thanks for your help on this!

Answer
I'm sorry, I don't have that kind of info. I'm more into the racing itself so I have driver and race stats and that type info but for economic impact, NASCAR fan base, race attendance and that kind of stuff you'd have to go right to the source.
For NASCAR's adress/phone/email, etc.:
http://www.jayski.com/pages/faqrace.htm#contact
(this link also has licensing info)

For all the tracks:
http://www.jayski.com/links/tracklinks.htm