Alexa gives some info on clickstream, but regardless of the search result order (e.g. 23.54% from google).

It also gives where visitors go on Wikipedia.org, which is helpful to get information about language breakdown (58%:En, 7.5:De)

http://www.alexa.com/siteinfo/wikipedia.org

Hope this is helpfuI, although it`s not perfectly what you are looking for.

Regards,
--
Haitham Shammaa
Contribution Research Manager
Wikimedia Foundation

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Click the "edit" button now, and help us make it a reality!



On Tue, Nov 13, 2012 at 12:47 PM, phoebe ayers <phoebe.wiki@gmail.com> wrote:
Hi all,

Are there any solid estimates out there of how many Google [or other]
searches have a Wikipedia article as the first [or second or third...]
hit? Any language breakdowns of this would be super cool as well.

I've seen offhand references to this phenomenon in many papers, but
I'm wondering if someone on this list knows of a particularly good
estimate or reliable information.

thanks,
Phoebe

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