Apple sold about 30 million Mac notebooks in the US in the last 4 years. Even if only half of those units were bought by unique individuals, that makes for 5 percent of the US population, a far cry from 0.1 percent.
(Background data: Apple has sold 100 million Macs in the last 4 years. 40% of those were sold in the US. Over 70% of the computers Apple sells are notebooks.)
You're saying >5% of all people in USA own a Mac notebook first sold in the last 4 years? That's quite unbelievable to me, I'm [relatively] poorer than I thought(!). Does anyone have corroborating stats on this - most pertinent I could find in a short search was that 75% of USA households have general-purpose computers (from 2011 http://www.census.gov/prod/2013pubs/p20-569.pdf [it's probably higher now]; ~50% use smartphones apparently). Combining those two suggests that >7% of all general purpose computers in the USA are Mac notebooks.
In any case the thread concerns the Mac Pro, not sure why I said laptop. At best it would be MBP sales that were relevant.
>"[...] The NPD Group’s 2009 Household Penetration Study, approximately 12 percent of all U.S. computer owning households own an Apple computer, up from 9 percent in 2008. While Apple ownership is growing, those households are decidedly in favor of mixed system environments. Of those 12 percent, nearly 85 percent also own a Windows-based PC.
Multiple computer ownership is a common thread in Apple computer households, with 66 percent of households owning three or more computers, compared to just 29 percent of Windows PC households. Apple owning households are decidedly more mobile as well, with 72 percent of them owning a notebook, whereas only 50 percent of households that have a Windows PC own a notebook." //
That gives us 72% of 12%, ~9% of households who have an Apple computer that also have some brand of notebook.
All the numbers and percentages I used came from Apple’s financial statements. Mac sales have gone up significantly since 2009, but the NPD survey you quoted is in line with what I wrote earlier.
As for Mac Pros: of course that market is tiny. There are no official sales figures available, but I estimate that around 2 million Mac Pros were sold in the US in the last 4 years. That’s less than 1 percent of the population, but a lot more than 1 percent of 1 percent.
You mean 1% of the 1% in the US that can afford, and still want, an Apple laptop?