If I recall from my reading yesterday, they went by vehicle registrations. And if a vehicle was registered for 6 months, it would take another vehicle registered for 6 months to equal 1 for that year.
I'm with you both, I'm a firm skeptic when it comes to any statistics, and I actually went to the survey link just to see, since I had the same reaction that this had to be skewed. But I felt much better about it after reading (admit: skimming) the results and methods. I didn't have any real immediate issues.
In fact, I was even surprised at the total numbers of the 350Z, but I would have been surprised at 80k, too. Go figure.
