I actually downloaded the open source Wordpress software and installed it on .. um... three of my domains. (Plus two subdomains on my main domain -- five installations.)
If you want the hard numbers then I would see about adding Google Analytics to your site. It's a pretty good and free way to track your visitors.
It also keeps track of things like your visitors screen resolutions, how many colors they can show, what browser/os they used to view your site. None of it personally identifiable - just a count of how many hits/visitors used a certain setup. I know that's not what you want, but it's also an indicator of just how many of those hard numbers will be available to you.