As of today:
Source:
IIHF Team Statistics
TOP 11 U20 Attendances Since 2000 (By Average) Location, Total Attendance, Average Attendance
2009 Top Ottawa, Canada 453,282 14,622
2006 Top Kamloops, Kelowna & Vancouver, Canada 325,138 10,488
2003 Top Halifax & Sydney, Canada 231,393 7,464
2005 Top Grand Forks & Thief River Falls, USA 193,256 6,234
2002 Top Pardubice & Hradec Kralove, Czech Rep 111,128 3,628
2008 Top Pardubice & Liberec, Czech Republic 103,179 3,328
2004 Top Helsinki & Hameenlinna, Finland 102,869 3,318
2001 Top Moscow & Podolsk, Russia 82,400 2,423
2003 DIV IA Almaty, Kazakhstan 35,300 2,353
2008 DIV IB Riga, Latvia 33,320 2,221
2007 Top Leksand & Mora, Sweden 63,493 2,048
So it would seem attendance will be close the the second best ( Kamloops, Kelowna & Vancouver ) - thats pretty damn good IMO.