Year | Value | 2021 | 45.517362296354 | 2020 | 45.517362296354 | 2019 | 45.517362296354 | 2018 | 46.110864235842 | 2017 | 46.963078355314 | 2016 | 47.602792862684 | 2015 | 48.091543832428 | 2014 | 48.10705973623 | 2013 | 55.492629945694 | 2012 | 56.501163692785 | 2011 | 57.377812257564 | 2010 | 58.099301784329 | 2009 | 58.650116369278 | 2008 | 59.402637703646 | 2007 | 60.147401086113 | 2006 | 61.00077579519 | 2005 | 62.102404965089 | 2004 | 62.684251357642 | 2003 | 64.018619084562 | 2002 | 64.724592707525 | 2001 | 65.461598138092 | 2000 | 66.167571761055 | 1999 | 67.261442979053 | 1998 | 68.130333591932 | 1997 | 69.705197827774 | 1996 | 71.155934833204 | 1995 | 71.093871217998 | 1994 | 71.140418929403 | 1993 | 71.062839410396 | 1992 | 71.1171450737 | 1991 | 71.093871217998 | 1990 | 71.543832428239 | 1989 | 71.489526764934 | 1988 | 71.210240496509 | 1987 | 71.194724592708 | 1986 | 71.21799844841 | 1985 | 71.249030256012 | 1984 | 71.44297905353 | 1983 | 71.233514352211 | 1982 | 71.419705197828 | 1981 | 71.419705197828 | 1980 | 71.21799844841 | 1979 | 71.22575640031 | 1978 | 71.179208688906 | 1977 | 70.690457719162 | 1976 | 70.713731574864 | 1975 | 70.737005430566 | 1974 | 70.915438324282 | 1973 | 70.930954228084 | 1972 | 71.062839410396 | 1971 | 71.024049650892 | 1970 | 71.024049650892 | 1969 | 70.938712179985 | 1968 | 70.930954228084 | 1967 | 70.698215671063 | 1966 | 70.519782777347 | 1965 | 67.323506594259 | 1964 | 69.751745539178 | 1963 | 69.984484096199 | 1962 | 69.061287820015 | 1961 | 69.123351435221 |
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