John Hammeken has seen concerts during 30 years.

Year   Concerts Seen  
2023 5 concerts
2022 6 concerts
2021 5 concerts
2020 1 concert
2019 1 concert
2018 3 concerts
2017 6 concerts
2016 8 concerts
2015 14 concerts
2014 21 concerts
2013 9 concerts
2012 6 concerts
2011 2 concerts
2010 2 concerts
2009 4 concerts
2008 1 concert
2007 2 concerts
2006 3 concerts
2005 5 concerts
2004 9 concerts
2003 15 concerts
2002 8 concerts
2001 4 concerts
2000 1 concert
1999 1 concert
1998 1 concert
1997 4 concerts
1996 5 concerts
1995 4 concerts
1993 2 concerts