Year |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
1950 | 20 | 23 | 25 | 23 | 13 | 5 | 23 | 24 | 23 | 23 | 23 | 24 |
1951 | | | | | | | | | | | | |
1952 | | | | | | | | | | | | |
1953 | 23 | 22 | 23 | 25 | 10 | 23 | 27 | 24 | 24 | 25 | 24 | 25 |
1954 | 23 | 22 | 27 | 24 | 24 | 25 | 25 | 22 | 16 | 23 | 17 | 1 |
1955 | | | | | | | | | | | | |
1956 | | | | | | | | | | | | |
1957 | 19 | 23 | 26 | 25 | 25 | 25 | 26 | 23 | 18 | 21 | 24 | 25 |
1958 | 26 | 23 | 27 | 26 | 26 | 11 | 27 | 26 | 26 | 27 | 18 | 27 |
1959 | 26 | 22 | 25 | 24 | 25 | 24 | 24 | 13 | 22 | 26 | 24 | 21 |
1960 | 22 | 24 | 24 | 24 | 16 | 24 | 23 | 27 | 23 | 25 | 22 | 24 |
1961 | 24 | 22 | 25 | 26 | 24 | 26 | 25 | 25 | 14 | 23 | 24 | 25 |
1962 | 25 | 21 | 25 | 22 | 24 | 12 | 24 | 24 | 22 | 23 | 20 | 22 |
1963 | 24 | 23 | 23 | 24 | 12 | 20 | 26 | 23 | 21 | 24 | 22 | 20 |
1964 | 24 | 2 | 22 | 23 | 20 | 23 | 25 | 11 | 20 | 24 | 23 | 24 |
1965 | 20 | 21 | 25 | 24 | 21 | 23 | 13 | 24 | 21 | 24 | 23 | 22 |
1966 | 21 | 23 | 22 | 20 | 21 | 24 | 12 | 21 | 22 | 19 | 20 | 21 |
1967 | 23 | 19 | 24 | 21 | 18 | 20 | 14 | 24 | 21 | 22 | 20 | 17 |
1968 | 23 | 19 | 22 | 20 | 19 | 21 | 23 | 19 | 10 | 23 | 20 | 20 |
1969 | 23 | 19 | 21 | 22 | 22 | 21 | 11 | 21 | 22 | 23 | 20 | 19 |
1970 | 19 | 20 | 17 | 23 | 22 | 22 | 17 | 22 | 21 | 24 | 21 | 20 |
1971 | 23 | 22 | 19 | 17 | 23 | 20 | 24 | 22 | 11 | 20 | 21 | 23 |
1972 | 21 | 22 | 21 | 22 | 20 | 24 | 20 | 13 | 21 | 18 | 20 | 21 |
1973 | 23 | 19 | 23 | 20 | 21 | 23 | 11 | 25 | 19 | 21 | 18 | 20 |
1974 | 22 | 21 | 22 | 10 | 18 | 23 | 13 | 16 | 23 | 24 | 21 | 20 |
1975 | 22 | 17 | 23 | 22 | 21 | 20 | 23 | 13 | 23 | 16 | 22 | 23 |
1976 | 24 | 20 | 25 | 20 | 20 | 22 | 16 | 24 | 24 | 21 | 22 | 14 |
1977 | 21 | 21 | 23 | 17 | 19 | 19 | 15 | 19 | 23 | 24 | 18 | 25 |
1978 | 23 | 18 | 18 | 22 | 16 | 25 | 18 | 25 | 14 | 23 | 20 | 7 |
1979 | 21 | 4 | 23 | 21 | 23 | 19 | 19 | 7 | 14 | 18 | 11 | 12 |
1980 | 22 | 21 | 22 | 23 | 21 | 22 | 14 | 22 | 20 | 19 | 18 | 16 |
1981 | 24 | 21 | 25 | 20 | 17 | 19 | | 2 | 10 | 24 | 25 | 20 |
1982 | 25 | 21 | 20 | 22 | 23 | 24 | 26 | 26 | 12 | 15 | 25 | 20 |
1983 | 22 | 21 | 18 | 15 | 17 | 24 | 12 | 23 | 23 | 21 | 19 | 19 |
1984 | 26 | 21 | 18 | 16 | 23 | 17 | 19 | 22 | 21 | 24 | 18 | 23 |
1985 | 21 | 19 | 20 | 23 | 12 | 20 | 25 | 26 | 17 | 21 | 21 | 23 |
1986 | 24 | 20 | 17 | 24 | 22 | 22 | 22 | 15 | 23 | 24 | 17 | 24 |
1987 | 22 | 19 | 22 | 19 | 19 | 25 | 26 | 10 | 22 | 25 | 9 | 20 |
1988 | 23 | 19 | 22 | 22 | 13 | 22 | 24 | 19 | 16 | 22 | 22 | 19 |
1989 | 18 | 20 | 24 | 20 | 21 | 8 | 25 | 23 | 21 | 14 | 25 | 16 |
1990 | 21 | 18 | 23 | 17 | 18 | | 1 | | | | | |