Yep, GoD was released Feb 10, 2004, which was during EverQuest's 5th year.
March 16, 1999 - March 15, 2000 = Year 1
March 16, 2000 - March 15, 2001 = Year 2
March 16, 2001 - March 15, 2002 = Year 3
March 16, 2002 - March 15, 2003 = Year 4
March 16, 2003 - March 15, 2004 = Year 5
March 16, 2004 - March 15, 2005 = Year 6
March 16, 2005 - March 15, 2006 = Year 7
March 16, 2006 - March 15, 2007 = Year 8
March 16, 2007 - March 15, 2008 = Year 9
March 16, 2008 - March 15, 2009 = Year 10
March 16, 2009 - March 15, 2010 = Year 11
March 16, 2010 - March 15, 2011 = Year 12
March 16, 2011 - March 15, 2012 = Year 13
March 16, 2012 - March 15, 2013 = Year 14
March 16, 2013 - March 15, 2014 = Year 15
March 16, 2014 - March 15, 2015 = Year 16