NASCAR is one of the most viewed professional sports in terms of television ratings in the United States. In fact, professional football is the only sport in the United States to hold more viewers than NASCAR.[5] Internationally, NASCAR races are broadcast in over 150 countries.[6] NASCAR holds 17 of the top 20 attended single-day sporting events in the world,[7] and claims 75 million fans who purchase over $3 billion in annual licensed product sales. Fortune 500 companies sponsor NASCAR more than any other motor sport,[8] although this has been in decline since the early 2000s
http://en.wikipedia.org/wiki/NASCAR