| Year | Volume | Number |
|---|---|---|
| 1995 | 43 | 1 2 |
| 1994 | 42 | 1-2 |
| 1993 | 41 | 1-2 |
| 1992 | 40 | 1-2 |
| 1991 | 39 | 1 2 |
| 1990 | 38 | 1 2 |
| 1989 | 37 | 1 2 |
| 1988 | 36 | 1-2 |
| 1987 | 35 | 1 2 |
| 1986 | 34 | 8 articles |
| 1985 | 33 | 1 2 |
| 1983 | 32 | 1 2 |
| 1982 | 31 | 1 2 |
| 1981 | 30 | 1 |
| 1980 | 29 | 1 2 |
| 1979 | 28 | 1 2 |
| 1978 | 27 | 2 |
| 1977 | 26 | 1 2 |
| 1976 | 25 | 1 2 |
| 1975 | 24 | 6 articles |
| 1974 | 23 | 7 articles |
| 1973 | 22 | 6 articles |
| 1972 | 21 | 9 articles |
| 1971 | 20 | 1 2 |
| 1970 | 19 | 5 articles |
| 1969 | 18 | 1 |
| 1968 | 17 | 1 |
| 1967 | 16 | 1 |
| 1966 | 15 | 1 |
| 1965 | 14 | 9 articles |
| 1963 | 13 | 1 2 |
| 1962 | 12 | 1 2 3 |
| 1961 | 11 | 2 3 4 |
| 1960 | 11 | 1 |
| 1959 | 10 | 1 2 3 |
| 1958 | 9 | 1-2 |
| 1957 | 8 | 1-2 |
| 1956 | 7 | 1-2 |
| 1955 | 6 | 1-2 |
| 1954 | 5 | 1-2 |
| 1953 | 4 | 1-2 |
| 1952 | 3 | 1-2 |
