The other thing about that statistic is that it is the change of a single near-Earth object hitting earth. And although they propose that equation we are still

The other thing about that statistic is that it is the change of a single near-Earth object hitting earth. And although they propose that equation we are still working on the 140m and above asteroids. There is an estimate based on what we have discovered but as the technology improves to find the harder to detect asteroids we are still finding them at a generally increasing rate each year [0]. [0] https://cneos.jpl.nasa.gov/stats/site_140.html https://cneos.jpl.nasa.gov/stats/site_140.html