These are archived stats. Here you can check out how it all was before it became how it is now.
All the data collected from the players is perfectly anonymous. I have no information on and no interest in the progress of individual players, let alone personal information.
I can't even show you how you compare to the other players. So yes, your privacy is intact.
Statistics update once per minute. Totals and averages do not include the data of the present day.
Grand total: clicks.
You can click the legend to show/hide the graphs for individual levels, or them all at once.