Not the top 10% of applicants; the top 10% of test takers. I found a .pdf
here - lots of stats about the 2015 and 2016 testers, plus the 2017 testers, and accepted applicants. It's geared at adcoms but it's still interesting.
Key takeaway is ~125k people took the MCAT between 2015-2016, with ~150k total tests including people who took the test more than once. There's likely a ton of those people who weren't accepted in previous cycles still hanging around and reapplying, plus everyone who took the test in 2017 before applying the same year... that's a lot of tests. Would be interesting to see how many people constitute the 90th percentile and up for all 2017 testers plus previous year people without acceptances... I bet it's more people than we'd think.
If you guys want another laugh, I haven't seen anyone bring up Duke yet. Wasn't their accepted MCAT super low on the MSAR before, due to them being "holistic?" It's a 519 now.