Minnesota Thunder - Year-by-year average attendance (1997-2009)

Reference 1: Avg. Attendance.

Reference 2: 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 and 2009.

Source: http://en.wikipedia.org/wiki/Minnesota_Thunder