It's interesting that ~15% of OS X users are on Snow Leopard (I have an old iMac that doesn't support Mavericks running 10.6, but I mostly use it as a local server)

How many of those users are still using Safari 5.1 (as opposed to FF/Chrome/Opera)?

PS: It's even weirder that people are still using Lion when apparently any Mac that runs Lion can run Mavericks (and 10.9 in my experience is much more stable than 10.7).