Ken has seen concerts during 20 years.

Year   Concerts Seen  
2023 1 concert
2019 1 concert
2015 3 concerts
2014 1 concert
2009 1 concert
2007 1 concert
2001 1 concert
2000 1 concert
1999 1 concert
1992 1 concert
1991 3 concerts
1989 3 concerts
1987 2 concerts
1986 5 concerts
1985 3 concerts
1984 2 concerts
1981 1 concert
1980 1 concert
1979 3 concerts
1978 2 concerts