Security reports that state percentages in their headline arent even worth the paper they are invariable not printed on.

What you really need to see is the figures for the different OSs and even more importantly the numbers as they refer to variants.
A piece of malware, be it a virus, worm, trojan, etc, can have tens, hundreds, even thousands of variants (slight deviations of the code) and any anti-virus product worth its salt should have a way of detecting these variants using a single identity (or pattern file, depending on how the anti-virus company refers to them). So knowing that 5000 new viruses were seen on this OS, isnt actually as useful to know as the fact that actually 5 distinct viruses were discovered on this OS which actually counted for 5000 different variants.