What percentage of people run a 5 K?

i dont know the answer for a half marathon but i read that only 1 percent of the population has run a marathon(26.2) In a 2008 New York Times article about the Half Marathon becoming the hottest new distance in running, it estimates that 650,000 people completed half marathons in the US in 2007. A google search of the US population for 2007 gives a result of 301M total people. This would make the percentage of half-marathon finishers less than 1%. We're a pretty special group, eh? :)