Bestandslücken
[N=1992,33 - 1992,36; 1992,48 - 1992,49; 1993,8; 1993,38 - 1993,40; 1994,4; 1996,34; 1997,45; 1999,5; 1999,28; 2000,3-4; 2000,23 - 2000,31; 2000,34 - 2000,35; 2000,37 - 2000,52; 2001,4; 2001,12; 2001,20; 2001,24 - 2001,25; 2001,27 - 2001,35; 2001,37; 2001,47; 2001,50 - 2001,52;; L=2002 - 2004]