Year | Value | 2009 | 61.742 | 2008 | 67.986 | 2007 | 70.174 | 2006 | 77.975 | 2005 | 65.542 | 2004 | 61.267 | 2003 | 54.251 | 2002 | 49.31 | 2001 | 48.832 | 2000 | 58.174 | 1999 | 53.5 | 1998 | 34.7000007629 | 1997 | 38.0999984741 | 1996 | 34.5999984741 | 1995 | 32.2000007629 | 1994 | 32.2000007629 | 1993 | 30.6000003815 | 1992 | 28.1000003815 | 1991 | 26.8999996185 | 1990 | 26.1000003815 | 1989 | 29.3999996185 | 1988 | 27.2000007629 | 1987 | 29.1000003815 | 1986 | 37.4000015259 | 1985 | 36 | 1984 | 31.7999992371 | 1983 | 30.8999996185 | 1982 | 27.2999992371 | 1981 | 26.7000007629 | 1980 | 26.5 | 1979 | 0.8000000119 | 1978 | 0.6999999881 | 1977 | 7.8000001907 | 1976 | 13.6999998093 | 1975 | 11.6000003815 | 1974 | 10.8999996185 | 1973 | 8.3999996185 | 1972 | 8.1000003815 | 1971 | 7.3000001907 | 1970 | 5.9000000954 |
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