That could mean anywhere from literally none to 0.04% and it would get rounded to 0.0%. So anywhere from 0 people to 40 people at each of those scores.
I got a 44 last time I took the test, but I'm OCD about standardized tests (e.g. kept practicing the LSAT until I got a 180) plus this is my job. I've never met anyone else with a 44 or 45 in my years in the industry, but I've known bunches and bunches with 40 - 43. At Next Step, we've always got something like a dozen or two dozen people on staff at any one time who scored 40 - 43.
Ultimately, when it comes to these unobtainably high scores, the good news is that the bottom line boils down to this: "So what." They can't interview you
more just b/c you got an insane score.
The MCAT goal is simply, "Score high enough so that my MCAT score isn't a reason to lose out on an interview." And under that metric, there's nothing really more impressive about a 34 than a 44 - in both cases the admissions officers will go "Good MCAT score? Check! Good GPA? Check! Good EC's? Check! Okay let's interview her!"
If it's just a morbid curiosity thing, I actually don't know if the AAMC releases any specific numbers about the extreme ends of the scale. If you find any, do share!