I'm continually asked to provide a statistics on how many parents read the reports generated through the Portal Publishing section of the Report Printing module, honestly it would even be useful to tell which parents have download reports but we can't even do that - I know we can see when they have most recently logged in but we can't tell what they are doing so can't guarantee that they have read reports.
There is a 'Legacy Portal Statistics' part of the portal but that only tells us about bandwidth or type of files downloaded, and pdf isn't even included in the list of file types so must come under 'N/A'.