John went to 26 concerts

2014

2 concerts

2011

1 concert

2009

1 concert

2007

1 concert

2005

2 concerts

2001

1 concert

1997

1 concert

1994

2 concerts

1992

1 concert

1991

3 concerts

1990

1 concert

1989

1 concert

1988

2 concerts

1987

2 concerts

1986

3 concerts

1983

2 concerts