Bestand
1961,1; 1963,12; 1964,8; 1966,10; 1974,6; 1975,2-11; 1976,1-4,6-12; 1977,1-3; 1980,1,3,4,6,8,11,12; 1981,1-5,7-9,11; 1982,1-4,7,8; 1983,1,2,4,9-11; 1984,1,2,4-9,11; 1985,1,4-11; 1986,1,3,5,10-12; 1987,1-9,11,12; 1988,1-8,10-12; 1989,1,2,4-6,9-12; 1990,1-3,5-11; 1991,3,5,6,8,10; 1992,4-6,10,12; 1993,2,3,4-7; 1994 -