Year | Value | 2021 | 64.975 | 2020 | 65.371 | 2019 | 65.838 | 2018 | 65.412 | 2017 | 64.838 | 2016 | 64.392 | 2015 | 63.649 | 2014 | 62.905 | 2013 | 62.373 | 2012 | 61.543 | 2011 | 60.721 | 2010 | 59.73 | 2009 | 58.804 | 2008 | 57.592 | 2007 | 56.426 | 2006 | 55.149 | 2005 | 54.008 | 2004 | 53.235 | 2003 | 52.533 | 2002 | 51.517 | 2001 | 51.043 | 2000 | 50.538 | 1999 | 49.425 | 1998 | 49.927 | 1997 | 49.514 | 1996 | 48.924 | 1995 | 48.302 | 1994 | 47.861 | 1993 | 47.394 | 1992 | 46.901 | 1991 | 46.13 | 1990 | 44.557 | 1989 | 45.036 | 1988 | 45.061 | 1987 | 45.44 | 1986 | 37.811 | 1985 | 37.364 | 1984 | 36.429 | 1983 | 36.036 | 1982 | 43.767 | 1981 | 43.608 | 1980 | 43.217 | 1979 | 42.807 | 1978 | 41.9 | 1977 | 41.893 | 1976 | 41.895 | 1975 | 39.356 | 1974 | 39.453 | 1973 | 41.635 | 1972 | 41.55 | 1971 | 42.892 | 1970 | 42.815 | 1969 | 42.83 | 1968 | 42.844 | 1967 | 42.692 | 1966 | 40.15 | 1965 | 42.444 | 1964 | 42.275 | 1963 | 41.956 | 1962 | 41.403 | 1961 | 40.995 | 1960 | 40.33 |
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