5% of "whose server-side programming language we know"

From the website.

And 76% of these websites is PHP, which seems to mean.. they can determine PHP more easily for a website (nonetheless, there are indeed a lot of WordPress sites, but not this amount).

Right, so Im assuming that as you are saying 'Half the web runs on java', maybe you know more about what websites are using in their backend? Care to share where you are getting this information from?