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1972 - 4 copies
281, 283, 286, 288
1973 - 11 copies
289, 291, 294, 297-299, 302, 304, 312-314
1974 - 8 copies
315-316, 318, 324, 330, 335-336, 339
1975 - 10 copies
340-342, 344, 346, 348-349, 351-352, 358
1976 - 15 copies
374-376, 378-379, 381, 383-390, 392
1977 - 2 copies
395, 401
1978 - 1 copy
419
1979 - 3 copies
445, 451, 463
1980 - 8 copies
472, 481-482, 484-485, 487, 494-495
1981 - 7 copies
505-507, 516-517, 521-522
1982 - 23 copies (4 missing)
523, 525-526, 528-529, 531-547, 549
1983 - 26 copies (complete)
550-575
1984 - 26 copies (complete)
576-601
1985 - 26 copies (complete)
602-627
1986 - 25 copies (1 missing)
628-646, 648-653
1987 - 25 copies (1 missing)
654-666, 668-679
1988 - 25 copies (1 missing)
680-699, 701-705
1989 - 24 copies (2 missing)
706-717, 719-726, 728-731
1990 - 26 copies (complete)
732-757
1991 - 23 copies (3 missing)
758-779, 783
1992 - 19 copies (7 missing)
790-803, 805-809
1993 - 27 copies (complete)
810-836
1994 - 25 copies (1 missing)
837-859, 861-862
1995 - 26 copies (complete)
863-888
1996 - 25 copies (1 missing)
889-902, 904-914
1997 - to date