I haven't paid much attention to it in the past since I have other methods of tracking in place but in looking at the graphs they look odd.
The graphs suggest that Monday through Friday the ceiling is 22,000 for "top queries" but on Saturday/Sunday it falls to 18,000 "top queries" (on this particular site). The orange graph line telling me what % of those I captured.
The chart is useless to me without understanding the 22,000 and 18,000 limits (that never vary). How do those work ?