which wikimania conferences were held between 2005 & 2013?
wikimania 2005, wikimania 2006, wikimania 2007, wikimania 2008, wikimania 2009, wikimania 2010, wikimania 2011, wikimania 2012, wikimania 2013
of those, which was attended by the largest number of people?
wikimania 2012