The same is typically true for the other libraries, too. Another bias would be in the browser report. The logs cannot show how many people with old browsers are sitting at home, wishing to connect. It only show who actually makes it through. The logs do not accurately show what restricted databases are being used.
Summary creates reports on an ad hoc basis.
It does not create the reports and store them. Therefore, what you see today may not be the same results seen a week later.