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| Year |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
| 1950 | | | | | | | | | | | | |
| 1951 | | | | | | | | | | | | |
| 1952 | | | | | | | | | | | | |
| 1953 | | | | | | | | | | | | |
| 1954 | | | | | | | | | | | | |
| 1955 | | | | | | | | | | | | |
| 1956 | | | | | | | | | | | | |
| 1957 | | | | | | | | | | | | |
| 1958 | | | | | | | | | | | | |
| 1959 | | | | | | | | | | | | |
| 1960 | | | | | | | | | | | | |
| 1961 | | | | | | | 4 | | | | | |
| 1962 | | | | | 2 | | 3 | 1 | | 2 | 2 | 1 |
| 1963 | | | | | 2 | 1 | 6 | | | | | |
| 1964 | 5 | | 6 | 2 | 13 | 4 | 4 | | 20 | 10 | 4 | |
| 1965 | 9 | 20 | 5 | | 5 | 20 | 8 | 1 | 6 | 2 | 7 | 6 |
| 1966 | 2 | | | | | 2 | | 2 | 15 | 17 | 8 | 3 |
| 1967 | 11 | 3 | 7 | | | | | 4 | | | 4 | 6 |
| 1968 | 5 | | 4 | | | | 11 | | | | | |
| 1969 | | | | | | | | | | | | |
| 1970 | 2 | 19 | 4 | | 7 | | | 3 | 22 | | 4 | 4 |
| 1971 | | 12 | 9 | | 9 | | 2 | 23 | 10 | | 10 | 16 |
| 1972 | 10 | | 16 | 10 | | 3 | | | | 7 | 7 | |
| 1973 | 12 | 16 | 39 | 8 | 9 | 69 | | 2 | 1 | | | 2 |
| 1974 | 10 | | | 4 | | 14 | | | 16 | | | 22 |
| 1975 | 20 | 4 | 39 | 16 | 8 | | 8 | | 10 | | 49 | 25 |
| 1976 | 15 | 2 | 8 | 6 | | | 2 | 24 | 45 | 2 | 6 | 7 |
| 1977 | 12 | 13 | 5 | | | | 31 | 4 | 13 | 10 | | |
| 1978 | 38 | 16 | 15 | 19 | | 24 | 6 | | 4 | 48 | 6 | |
| 1979 | 9 | | | 30 | 26 | 9 | 31 | 17 | 10 | 22 | | 3 |
| 1980 | 2 | 14 | 8 | 24 | 17 | 17 | 21 | 14 | | 29 | | |
| 1981 | 24 | 7 | 32 | 12 | 13 | 4 | | | | 11 | 10 | 13 |
| 1982 | 10 | 10 | 5 | | 8 | 10 | 8 | 6 | 2 | 20 | 14 | 2 |
| 1983 | 2 | 20 | 10 | 22 | 10 | 12 | 10 | 4 | 14 | 5 | 2 | 8 |
| 1984 | 2 | 13 | 17 | 2 | 17 | 11 | 4 | 24 | 10 | 7 | | 8 |
| 1985 | 2 | | 10 | 8 | 2 | 8 | 34 | 2 | 6 | 16 | 20 | 32 |
| 1986 | 40 | 34 | 8 | 17 | 7 | 4 | 10 | 10 | 11 | 8 | 2 | 42 |
| 1987 | 22 | 10 | 14 | 24 | 15 | 6 | 2 | | 4 | | | 22 |
| 1988 | | | | 3 | 4 | 23 | 5 | 3 | 1 | 2 | 5 | |
| 1989 | | 10 | 9 | | | 2 | 2 | 21 | 9 | 2 | 3 | 3 |
| 1990 | 12 | 4 | 5 | 5 | | | | | | | | |