As of Dec. 2008 his estimated net worth was $205 million.
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Simple answer: A truckload of money. The real "financially independent" money in sports is not in the sport itself - it is in the endorsements.
Over the 17 years (plus one race in 1992) of his career he has made $111,782,788 that minus the $6,285 from 1992 is $111,856,503 and that divided by 17 is $6,979,704.29 a year.