Hugo Administrator Vincent Docherty, as is customary, has published statistics about the total 2011 Hugo nominating ballots received, with summary figures for each category such as the high/low vote ranges of nominees. They appear as an inclusion with the final ballot [PDF file] at the Renovation website.
In 2011 the minimum number of votes to make the ballot in the Best Fanzine category was 43, in Best Fan Writer, 30, and in Best Fan Artist, 23. All this despite the record number of nominating ballots, 1006.
Judged by the minimum number of votes needed to get on the final ballot, it was actually tougher for a fanzine or fan writer to get nominated than in four professional categories where stories or editors made the cut with less than 30 votes – Best Novelette, Best Short Story (which was truncated to four nominees because all others failed the 5% rule), Best Graphic Story and Best Editor, Long Form (where a tie for the fifth spot resulted in a total of seven nominees).