I would not imagine that those kind of statistics are posted anywhere. Here is the site for the parkway. They have a contact us link. Ask and they just may be able to provide them to you. Other than the official site I don't have any other suggestions. http://www.blueridgeparkway.org/
Yes, I've tried this, and I'm waiting for a reply from someone at that site now. I just thought someone here might know of a place to access the information directly.
In any case, thanks for the reply to my original question.