That could skew EPCOT's numbers since I always go in the evening for dinner and Illuminations. Also, I always go to AK early in the morning. So that would count as AK 1, EPCOT 0 even though I end up spending more time at EPCOT. I'm sure Disney's internal numbers tell them the pattern of peoples' visits and thus gives them an accurate picture. And of course they know how many people ride each ride.