Year | Value | 2021 | 79.115 | 2020 | 79.141 | 2019 | 79.266 | 2018 | 79.205 | 2017 | 79.158 | 2016 | 79.22 | 2015 | 79.268 | 2014 | 79.649 | 2013 | 79.31 | 2012 | 79.172 | 2011 | 79.466 | 2010 | 78.904 | 2009 | 78.721 | 2008 | 79.081 | 2007 | 78.914 | 2006 | 78.403 | 2005 | 78.073 | 2004 | 77.826 | 2003 | 77.323 | 2002 | 76.561 | 2001 | 76.907 | 2000 | 76.755 | 1999 | 76.505 | 1998 | 76.443 | 1997 | 75.766 | 1996 | 75.46 | 1995 | 75.214 | 1994 | 75.52 | 1993 | 73.759 | 1992 | 75.188 | 1991 | 74.219 | 1990 | 74.436 | 1989 | 74.524 | 1988 | 74.33 | 1987 | 73.838 | 1986 | 72.763 | 1985 | 72.435 | 1984 | 73.248 | 1983 | 71.006 | 1982 | 71.961 | 1981 | 70.759 | 1980 | 70.276 | 1979 | 69.223 | 1978 | 70.015 | 1977 | 69.658 | 1976 | 69.384 | 1975 | 68.313 | 1974 | 68.974 | 1973 | 68.855 | 1972 | 68.537 | 1971 | 68.402 | 1970 | 67.765 | 1969 | 68.26 | 1968 | 67.982 | 1967 | 70.156 | 1966 | 69.262 | 1965 | 68.831 | 1964 | 69.422 | 1963 | 67.043 | 1962 | 69.154 | 1961 | 66.455 | 1960 | 68.295 |
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