John Harrigan has seen concerts during 12 years.

Year   Concerts Seen  
2018 2 concerts
2015 2 concerts
2014 1 concert
2013 2 concerts
2010 3 concerts
2009 4 concerts
2008 6 concerts
2007 4 concerts
2006 3 concerts
2005 4 concerts
2004 1 concert
2003 1 concert