1949 2.00 20.21 -1.2 1950 2.25 19.73 1.3 1951 2.75 18.43 7.9 1952 2.75 18.08 1.9 1953 3.25 19.01 0.8 1954 3.00 19.57 0.7 1955 3.25 19.58 -0.4 1956 4.00 19.43 1.5 1957 4.50 20.83 3.3 1958 4.00 19.73 2.8 1959 5.00 18.87 0.7 1960 4.50 18.43 1.7 1961 4.50 18.31 1 1962 4.50 18.19 1 1963 4.50 17.89 1.3 1964 4.50 17.6 1.3 1965 5.00 17.2 1.6 1966 5.75 16.84 2.9 1967 5.50 16.56 3.1 1968 6.50 16 4.2 1969 8.50 15.95 5.5 1970 8.00 15.52 5.7 1971 6.00 15.85 4.4 1972 5.25 15.36 3.2 1973 8.75 16.59 6.2 1974 12.00 26.39 11 1975 7.25 27 9.1 1976 7.00 27.26 5.8 1977 7.00 26.78 6.5 1978 8.75 26.14 7.6 1979 11.50 32.98 11.3 1980 20.00 49.63 13.5 1981 20.50 66.2 10.3 1982 16.00 55.98 6.2 1983 11.00 49.8 3.2 1984 13.00 47.18 4.3 1985 9.50 42.4 3.6 1986 8.00 21.62 1.9 1987 8.25 25.68 3.6 1988 9.50 20.14 4.1 1989 11.00 24.22 4.8 1990 10.00 29.03 5.4 1991 8.50 23 4.2 1992 6.00 21.59 3 1993 6.00 18.68 3 1994 7.25 16.86 2.6 1995 8.75 18.17 2.8 1996 8.25 22.4 2.9 1997 8.50 20.39 2.3 1998 8.25 12.66 1.6 1999 8.00 17.78 2.2 2000 9.50 29.54 3.4 2001 6.75 23.39 2.8 2002 4.25 23.78 1.6 2003 4.00 28.42 2.2