Proceedings year: 2008 - $0.00 2007 - $19.50 2006 - $15.00 2005 - $18.00 2004 - $18.00 2003 - $15.00 2002 - $15.00 2001 - $15.00 2000 - $12.00 1999 - $12.00 1998 - $12.00