Index350 has seen concerts during 12 years.

Year   Concerts Seen  
2017 1 concert
2007 1 concert
2006 1 concert
2002 1 concert
2001 1 concert
1999 1 concert
1997 2 concerts
1996 1 concert
1995 2 concerts
1994 1 concert
1993 1 concert
1981 1 concert