According to the search results, the percentage of people who run a marathon varies depending on the population being considered. Here are some estimates:

• Worldwide: About 0.01% of the worlds population completes a marathon each year, which equates to approximately 1.1-1.3 million people.
• United States: Less than 1% of the population in the U.S. has completed a marathon.
• Female runners: About 54% of female runners have completed at least one marathon.
• Male runners: About 68% of male runners have completed at least one marathon.

Its worth noting that marathon participation accounts for only 12% of the total race results. While the popularity of marathons has grown over the past decade, with runners registering for 5Ks, 10Ks, half-marathons, full marathons, and more, its still not a common activity for most people.