Bestand
1977,1-2u.6; 1978,1u.3u.5-6; 1979,4; 1980,2-3u.5-6; 1981,1-2u.4-6; 1982,1-2u.4u.6; 1983,2-6; 1984,1-6; 1985,1-6; 1986,1-6; 1987,1-6; 1988,3; 1989,1-3u.5-6; 1990,1-2u.5; 1991,1-6; 1992,1-6; 1993,1-2; 1994,4; 1995,1u.3u.6; 1996,4u.6; 1997,2; 1998,1