That doesn't necessarily mean much, every time I went to the post office here in the UK and asked for something specific they went on their website and printed a page for me (not the most efficient use of resources but hey it works), there's also the case of terminals at public government offices where the public can go to use online resources (home office, and job center are a good example of that), this could be not that different from 30% of the site hits for HSBC in the UK which are from within the internet banking terminals in the branches.

But as tdlowden said apparently only 4% actually comes from US government networks so I guess it's not the case, tho I don't know if it's only federal or also local government since the US has a very tiered form of government.