Bestand
1.1968; 2.1969,2-4,7-10; 3.1970,1,6-8,11-12; 4.1971,1-8,10-12; 5.1972,1-10,12; 6.1973 - 8.1975; 9.1976,1-8,12; 10.1977,1/2,6/8,11/12; [11].1978,1-5; 12.1979,1-3,5-6; 13.1980,1-3,5; 14.1981,1-4; 15.1982,1-5; 16.1983,1-6; 17.1984,1-2,4/5,6; 18.1985,2/3