The snoopiest govts according to Google: USA is #1
google.com
google.com
Edit: While I haven't gone through these really systematically, I think that Mexico might have the lowest ratio, at one request per 3159742 citizens.
Note also that Switzerland apparently made no requests in this time period, so I assume will be lowest, and I guess there are countries who have legal jurisdiction over some part of Google but have never filed a request.