Year | Value | 2022 | 47.982557574551 | 2021 | 47.985081313859 | 2020 | 47.983852694326 | 2019 | 47.975799667598 | 2018 | 47.95764138671 | 2017 | 47.935619022988 | 2016 | 47.913484172317 | 2015 | 47.890598429374 | 2014 | 47.865229313073 | 2013 | 47.835324166301 | 2012 | 47.803632837569 | 2011 | 47.773452351386 | 2010 | 47.74436932345 | 2009 | 47.720389673508 | 2008 | 47.706130396673 | 2007 | 47.698837000822 | 2006 | 47.703798499089 | 2005 | 47.721564581778 | 2004 | 47.746118641965 | 2003 | 47.768773419781 | 2002 | 47.787539913877 | 2001 | 47.803387528727 | 2000 | 47.817171642938 | 1999 | 47.82607599773 | 1998 | 47.833020656028 | 1997 | 47.840475363769 | 1996 | 47.851464562847 | 1995 | 47.867210704903 | 1994 | 47.884366128174 | 1993 | 47.895238351969 | 1992 | 47.895351731844 | 1991 | 47.880493626541 | 1990 | 47.852722293953 | 1989 | 47.810806780392 | 1988 | 47.763222112656 | 1987 | 47.71549861523 | 1986 | 47.666896399782 | 1985 | 47.620773473466 | 1984 | 47.576417855989 | 1983 | 47.53008372516 | 1982 | 47.481940342687 | 1981 | 47.435341895167 | 1980 | 47.39083744227 | 1979 | 47.353011225368 | 1978 | 47.31863409822 | 1977 | 47.278733635793 | 1976 | 47.241633864602 | 1975 | 47.194759211729 | 1974 | 47.128020669188 | 1973 | 47.05578465108 | 1972 | 46.981531744951 | 1971 | 46.908139266789 | 1970 | 46.888164517377 | 1969 | 46.881915474087 | 1968 | 46.834793921877 | 1967 | 46.783679240274 | 1966 | 46.726863640051 | 1965 | 46.660743819261 | 1964 | 46.587868678298 | 1963 | 46.504374556637 | 1962 | 46.412319404574 | 1961 | 46.315952798369 | 1960 | 46.213810482022 |
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