Try "The Unofficial Guide to WDW" by Bob Sehlinger it has a breakdown on attendance every day of the year. I ordered mine from Overstock for around $12.00. Hope this helps!
I got it from a DIS thread a long time ago. And I have used it for the last several trips. The parks seemed to be just about as busy as the site said they would be the last 2 trips we were there. So I have been happy about that!
Not sure if anyone else has a better site. If so I would also like that!
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