I think we'll find that the statistics weren't kept for older questions from quizzes and starting to track % some time after their release would not have been a true value of the % correct and so it is not shown (but I suspect there is a value stored for quiz assembly purposes, we just won't see it). I will qualify that as opinion and not based on anything but reading previous postings in other threads about it under other thread titles.
If you aren't seeing Heaven while you dream, you're doing something wrong.
Dreams allow escape from the passage of Time.
The ultimate activity is the Dream.