John Mannix has seen concerts during 12 years.

Year   Concerts Seen  
2017 2 concerts
2016 1 concert
2014 1 concert
2013 1 concert
2011 2 concerts
2010 1 concert
2004 1 concert
2002 1 concert
1983 1 concert
1979 1 concert
1977 2 concerts
1976 1 concert