Year | Value | 2022 | 49.274522796066 | 2021 | 49.275385590041 | 2020 | 49.280620850383 | 2019 | 49.2852559543 | 2018 | 49.284040903602 | 2017 | 49.280907802014 | 2016 | 49.277433057322 | 2015 | 49.274663980778 | 2014 | 49.272807922333 | 2013 | 49.271519217881 | 2012 | 49.270562648171 | 2011 | 49.269817198096 | 2010 | 49.269297410026 | 2009 | 49.269067082519 | 2008 | 49.269059929561 | 2007 | 49.269106669285 | 2006 | 49.269260739653 | 2005 | 49.269654414064 | 2004 | 49.279485828938 | 2003 | 49.298862196232 | 2002 | 49.317874898793 | 2001 | 49.336095381958 | 2000 | 49.353160960036 | 1999 | 49.368697620022 | 1998 | 49.379743140689 | 1997 | 49.389762420542 | 1996 | 49.401825412773 | 1995 | 49.404575968847 | 1994 | 49.399125670773 | 1993 | 49.394248202163 | 1992 | 49.389023060319 | 1991 | 49.383181941396 | 1990 | 49.379041681055 | 1989 | 49.376780958806 | 1988 | 49.38718778288 | 1987 | 49.430757056453 | 1986 | 49.489215649879 | 1985 | 49.549485866989 | 1984 | 49.617621549157 | 1983 | 49.675920114043 | 1982 | 49.703485718115 | 1981 | 49.710256385352 | 1980 | 49.716329898293 | 1979 | 49.781119499638 | 1978 | 49.874030859083 | 1977 | 49.911079810971 | 1976 | 49.921287999745 | 1975 | 49.925755767095 | 1974 | 49.928986993046 | 1973 | 49.932065901108 | 1972 | 49.926359355589 | 1971 | 49.920747770425 | 1970 | 49.92520759647 | 1969 | 49.929921597543 | 1968 | 49.933618469864 | 1967 | 49.935308726765 | 1966 | 49.933604743807 | 1965 | 49.927330637682 | 1964 | 49.916499294141 | 1963 | 49.901563906936 | 1962 | 49.883851858397 | 1961 | 49.864959368545 | 1960 | 49.845279948862 |
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