This information is almost unimportant to me, because it does not show how good/bad an AV is, but only that a certain percentage of people use it. Even if these data are correct, it only means that those companies that are at the top have cheaper products or better marketing, not necessarily that they are better than some other AVs that are not even mentioned in the list.
The average user is not qualified to evaluate the functionality or level of protection of a particular AV anyway, and the choice mainly boils down to the fact that the software is not too expensive and has an eye-pleasing interface.
To find how good/bad an AV is - just Google search - antivirus software testing.