Year | Value | 2022 | 48.74349354651 | 2021 | 48.742894946467 | 2020 | 48.703871884452 | 2019 | 48.724686368752 | 2018 | 48.908614915596 | 2017 | 49.240757554593 | 2016 | 49.576227005288 | 2015 | 49.755331359874 | 2014 | 49.831524459474 | 2013 | 49.847850776486 | 2012 | 49.830985827733 | 2011 | 49.78937840792 | 2010 | 49.703298118637 | 2009 | 49.451380175659 | 2008 | 49.127992068363 | 2007 | 49.05580513896 | 2006 | 49.346532048541 | 2005 | 49.728141023267 | 2004 | 49.920132986274 | 2003 | 49.976708154906 | 2002 | 49.967338202489 | 2001 | 49.943555907698 | 2000 | 49.948127988858 | 1999 | 49.941287919719 | 1998 | 49.919973749932 | 1997 | 49.906396025885 | 1996 | 49.890947732939 | 1995 | 49.870554876887 | 1994 | 49.853506821323 | 1993 | 49.851098010094 | 1992 | 49.85570040802 | 1991 | 49.837785039013 | 1990 | 49.805700751709 | 1989 | 49.781064013089 | 1988 | 49.770123681062 | 1987 | 49.772387331729 | 1986 | 49.761461556479 | 1985 | 49.727416103354 | 1984 | 49.695214809932 | 1983 | 49.6535670157 | 1982 | 49.617299514947 | 1981 | 49.611489851959 | 1980 | 49.598051370568 | 1979 | 49.578708274851 | 1978 | 49.562915565572 | 1977 | 49.535574414003 | 1976 | 49.504640308022 | 1975 | 49.47952492319 | 1974 | 49.472549830222 | 1973 | 49.479220620227 | 1972 | 49.474403774541 | 1971 | 49.452638828933 | 1970 | 49.433652209637 | 1969 | 49.427305409247 | 1968 | 49.417037687806 | 1967 | 49.42684902831 | 1966 | 49.44254078658 | 1965 | 49.454263711007 | 1964 | 49.445516803723 | 1963 | 49.431004597181 | 1962 | 49.444946961599 | 1961 | 49.460960105462 | 1960 | 49.485093924792 |
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