Bestandslücken
[N=10.1986,37,39-45,47-52;11.1987-15.1991;16.1992,1-43,45-47,49-52; 17.1993,1,3-4,6-8,10-12,14-16,18-20,22-24,26-28,30-32,34-36,38-40,42-44,46-47,49,51; 18.1994,1-5,7-9,11-13,15-17,19-21,23-24,26-29,31-33,35-37,39-41,43-45,47-49; 19.1995,1,3-5,7-9, 11-13, 15-17,19-21,23-25,27-29,31-33,35-37,39-41,43-45,47-49,51; 20.1996,1-2,4-6,8-10,12-14,16-18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50; 21.1997,1-2,4,6,8,10,12,14,16,18,20,22,24-51;22.1998-27.2003;28.2004,1-3]