Wierje has seen concerts during 16 years.

Year   Concerts Seen  
2016 1 concert
2013 1 concert
2010 1 concert
1999 1 concert
1993 2 concerts
1992 1 concert
1987 2 concerts
1986 1 concert
1984 1 concert
1981 2 concerts
1980 2 concerts
1977 2 concerts
1975 4 concerts
1974 4 concerts
1973 15 concerts
1972 3 concerts