Chris Hartley has seen concerts during 20 years.

Year   Concerts Seen  
2016 1 concert
2012 1 concert
2003 1 concert
2002 1 concert
1993 2 concerts
1992 2 concerts
1991 1 concert
1989 1 concert
1986 1 concert
1984 1 concert
1983 2 concerts
1982 3 concerts
1980 1 concert
1979 1 concert
1978 4 concerts
1977 1 concert
1976 1 concert
1975 11 concerts
1974 7 concerts
1972 1 concert