(2007)

(Untersuchung 2006 bis 2007)

(Untersuchung 2006)

(Untersuchung 2005)

(Untersuchung 2004)

(Untersuchung 2001 bis 2004)

(2004)

(Untersuchung 2003)

(2001)

(Untersuchung 1999)

(Untersuchung 1999)

(Untersuchung 1998)

(Untersuchung 1996)

(Untersuchung 1995)

(Untersuchung 1987)

(Untersuchung 1984)

(1963)

(Untersuchung 1962)

(Untersuchung 1954)