Bestand
1974,1-5,10-11; 1975,1-7,9-10,12; 1976,1-3,7,10-11; 1977,1-2,5-7; 1978,1-4,8-9,11-12; 1979,1-7; 1980,2,5-6,9-12; 1981,1-2,7-8,11-12; 1982,4-5; 1983,2-3,8-9,12; 1984,7-8,12; 1985,1-2,6-9,11-12; 1986,6-7,9-10; 1987,3-4,9-12; 1989,1-5,10-12; 1990,2-3,10-12; 1991,5-8; 1992,1,4-12; 1993,1-2,4,7-12; 1994,1-11; 1995,2-11; 1996,1-6,9-10; 1997,1-3,6-12; 1998,4-5;