Firstly, they didn't even release figures for Apple. They only mentioned Toshiba being 5th place, and having just under 20% marketshare. Apple, in 6th place, must have between 0 to 19% of the market.
Secondly, the numbers don't make sense. If Toshiba is 5th place and has 20% of the world market (they were nowhere near 20% last year), then the companies in 4th, 3rd, 2nd, and 1st place must have greater than or equal to 20% share in 2007. Between the top 5 companies, that would add up to >100% of the market.
Add Apple to the list, and you're well over 100%.
If Gartner is going to make stuff up, they may as well hire me. I'm good at making stuff up.