This doesn't translate remotely into sales.
See http://www.forbes.com/sites/chuckjones/2013/10/10/pc-market-consolidating-around-top-3-vendors/ for example. An estimate of 4.4 million Macs compared to around 14 million from Lenevo, 14 million from HP and 9.5 million from HP.
Instead of looking at unit sales, look at revenue. And suddenly, Apple is up there.
Instead of looking at revenue, look at profit. And suddenly, Apple is the absolute leader, with last estimates 45% of all profits going to Apple (more than 3 times more than Dell, and that was before Dell's profits dropped).