Bestandslücken
[N=1982,3401; 1982,3404; 1985,3635; 1988,3773; 1990,3884; 1991,3935; 1992,3970; 1993,4006; 1994,4084; 1996,4178; 1998,4267; 1998,4285 - 1998,4286; 1999,4357; 2000,4409; 2005,4644; 2006,4715; 2008,4793; 2012,4976 - 2012,4977; 2012,4986; 2012,4990]