Bestand
29.1978,5 - 50.1999,11; 64.2013,2 -
Bestandslücken
[N=29.1978,6,8-11; 30.1979,3-4,6-11; 31.1980,1,4,6-9,12; 32.1981,5-6,10-11; 33.1982,5,10-11; 34,1983,10,12; 35.1984,8,10; 36.1985,2-5,8; 37.1986,2,4,7-8,12; 38.1987,1-5,11-12; 39.1988,3,6-9; 40.1989,7-10,12; 41.1990,2-4,7-8,11-12; 42.1991,1-3,5-6; 44.1993,1; 45.1994,7]