Bestand
1968,67; 1970,1-54; 1971,1-47; 1972,1-47; 1973,1-14,16-18,21-45; 1974,1-27,30-48; 1975,1-52; 1976,1-46; 1977,1-38; 1978,1-2,4-14; 1979,5-6,8,12,15,18-19,22; 1980,2,9,14,16; 1981,4,17-18; 1982,7,9,11,14-15,18; 1983,2,4,7-16; 1984,1-16; 1985,1,3-13; 1986,1-3,5-8,10-13; 1987,1-7,9-13; 1988,1-10,12-20; 1989,1-13,15-17