Too bad they only presented tech companies. It would be interested to compare Apple vs Shell or BP, just to get an idea of the differences.
Apart from this detail, your point is very interesting. I wonder, all industries considered, how much % of worldwide's revenue is earned by nationally owned companies versus the corporations counterparts.
Shell, by the way, is $14,800/second. These numbers are public and trivially discoverable.
The bar chart somebody linked to showed the same data in a much nicer way. Easier to grasp at a glance, and easier to make comparisons.
To make the page's visual work it would have been better to show later numbers in terms of the previous companies. Show, for example, that Facebook is 1.3 Blackberries, Nokia is 4 Facebooks, etc.