Clarke has seen concerts during 15 years.

Year   Concerts Seen  
2006 6 concerts
2005 17 concerts
2004 16 concerts
2003 10 concerts
2002 15 concerts
2001 14 concerts
2000 13 concerts
1999 14 concerts
1998 9 concerts
1997 13 concerts
1996 12 concerts
1995 8 concerts
1994 8 concerts
1993 10 concerts
1992 12 concerts