Holdings
1969,13 - 22,25 - 39,41 - 46,48 - 52; 1970,1,3 - 50; 1971,1-26, 28 - 32;34 - 52; 1972,1 - 37,39,50; 1973,1,2,4 -12,18 - 25,30,32,34,35,40 - 42,46 - 48; 1974,1,4,7,9,14,22,25,33,41,42; 1975,2,13,15,16,24,29,33,36,39; 1976,4,6,8,11,13,18,22-24,35,36,39,40,41,51; 1977,3,4,7,12,41,46,48; 1978,28,31,45,51-52; 1979,6,23,28-30,41,42,45; 1980,2,14,18,25,27,35,36,42,44 - 46,50; 1981,9,10,17,18,25,28 - 30,38,44,46,50 - 52; 1982,1 - 2, 6,9,10,26,27,31 - 33,36,42 - 45,47,48,50; 1983,2,4,5,10,13 - 17,24,25,30,39 - 42, 45 - 47,49; 1984,2 - 11,13,14,16 - 18,20,22,25 - 27,38,41 - 45,48 - 50; 1985,1,3 - 6,9,11 - 13,17,18,21 - 23,26 - 31,33 - 47,49 - 52; 1986,1,3 - 8,10 - 12,17,20 - 23,32 - 36,42,43,48 - 52; 1987,4 - 9,11 - 22,24 - 27,29,32,35,39 - 49,51; 1988,3,9,13,16,17,20 - 24,28 - 31,39 - 43,45 - 48; 1989,1 - 3,5 - 11,13 - 22,26,27,29 - 34,36,40,47 - 48; 1990,6,7,25,37,38; 1991,10,40,44; 1992,22,23,33; 1994,49; 1998,6 - 8,45; 2004,49; 2006,50