Chris Hartley has seen concerts during 15 years.

Year   Concerts Seen  
2016 1 concert
2003 1 concert
1993 1 concert
1992 2 concerts
1991 1 concert
1989 1 concert
1986 1 concert
1983 1 concert
1982 2 concerts
1979 1 concert
1978 2 concerts
1976 1 concert
1975 10 concerts
1974 6 concerts
1972 1 concert