Bestandslücken
[N=4.1964,5; 5.1964,1; 6.1965,1; 8.1966,6; 10.1967,1-2; 13.1968,2; 15.1969,4; 42.1983,5-6; 43.1983,1 ; 47.1985,4-5; 48.1986,1,3; 49.1986,3; 50.1987,3; 52.1988,1,3-4; 53.1988,1-3,5; 54.1989,1-5; 55.1989,3; 56.1990,1-5; 57.1990,4,6; 58.1991,5-6; 59.1991,1,3; 60.1992,1,4-6; 61.1992,2; 62.1993,4; 63.1993,2-3,6; 65.1994,3,5-6; 66.1995,1,3; 67.1995,1,5-6; 68.1996,5; 71.1997,1,3,6; 72.1998,2,4-6; 73.1998,4; 74.1999,4,6; 77.2000,1,3-4,6; 78.2001,5-6; 79.2001,3-4; 81.2002,5; 82.2003,1-2; 83.2003,3]