Michael O'shea has seen concerts during 17 years.

Year   Concerts Seen  
1996 1 concert
1992 1 concert
1990 1 concert
1989 2 concerts
1988 2 concerts
1987 4 concerts
1985 2 concerts
1984 7 concerts
1983 6 concerts
1982 4 concerts
1981 1 concert
1980 2 concerts
1979 5 concerts
1978 5 concerts
1977 4 concerts
1976 2 concerts
1975 2 concerts