SGMA (Sporting Goods Manufacturers Association) tells us that 921,000 Americans participated in at least one triathlon in 2006, while that number jumped to more than 1.1 million in 2007. That is a 19.5 percent growth rate. If that continued for 2008 and 2009 we are looking at 1,570,828 participants.
Roger W.
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There are up to 6 percent of the population in the United States alone that will run a triathlon. This number is slightly less for the world-wide population as a whole.
it really depends on, like the pool size, and where you live...its diffrent for everyplace!