Cristian Consonni, 08/09/2015 19:42:
we (Wikimedia Italia) are starting writing a proposal for a EU project (in the Horizon 2020 framework) and our partners asked us for "numbers to quantify the readership of Wikipedia in the various languages interested by the project".
Traditionally, for this purpose Wikimedia Italia used the Nielsen NetRatings, which AFAIK are/were available for several European countries. I can't easily find them in their new websites though.
Nemo