The results are probably due to two trends. The default installations of new Linux systems are much more secure than previous versions of the open-source operating system. Secondly, attackers seem to be much more concentrated on Windows systems than on Linux systems, and on attempting to fool desktop users, of which the vast majority use Windows.
So things are going well for Linux on the security front. Itís a shame that not the same thing can be said for Windows, which is apparently getting easier and easier to crack into. Unpatched Windows systems continue to be compromised more quickly, sometimes within minutes.