Patrik Boumans has seen concerts during 13 years.

Year   Concerts Seen  
2017 1 concert
2009 3 concerts
2006 1 concert
2005 1 concert
1992 4 concerts
1990 1 concert
1988 1 concert
1982 3 concerts
1980 1 concert
1979 1 concert
1977 3 concerts
1976 1 concert
1973 1 concert