Year | Value | 2022 | 47.844762967659 | 2021 | 48.340308884177 | 2020 | 48.854287930356 | 2019 | 49.376211605977 | 2018 | 49.912945077719 | 2017 | 50.457926609831 | 2016 | 51.007476773444 | 2015 | 51.560927401189 | 2014 | 52.121759960485 | 2013 | 52.677693459421 | 2012 | 53.226089371987 | 2011 | 53.76637960238 | 2010 | 54.315716700792 | 2009 | 54.892817107284 | 2008 | 55.472646911373 | 2007 | 56.053695240883 | 2006 | 56.618816698508 | 2005 | 57.195851969259 | 2004 | 57.781881826098 | 2003 | 58.361606303606 | 2002 | 58.932435602913 | 2001 | 59.498294905042 | 2000 | 60.023319328964 | 1999 | 60.497844098334 | 1998 | 60.962717898574 | 1997 | 61.427456449279 | 1996 | 61.886058523665 | 1995 | 62.337602287594 | 1994 | 62.793906745785 | 1993 | 63.252370445086 | 1992 | 63.706760737098 | 1991 | 64.164339681562 | 1990 | 64.629853607462 | 1989 | 65.107210270751 | 1988 | 65.581555277615 | 1987 | 66.070863364022 | 1986 | 66.562382018662 | 1985 | 67.058903298039 | 1984 | 67.55718796367 | 1983 | 68.052975971909 | 1982 | 68.531320979876 | 1981 | 69.048463615784 | 1980 | 69.605465416534 | 1979 | 70.154655104383 | 1978 | 70.690492576044 | 1977 | 71.141564179603 | 1976 | 71.506657780353 | 1975 | 71.867718557583 | 1974 | 72.174755613411 | 1973 | 72.526786514655 | 1972 | 72.841442561133 | 1971 | 73.124851910388 | 1970 | 73.375022898537 | 1969 | 73.614952655495 | 1968 | 73.857471616108 | 1967 | 74.101505609634 | 1966 | 74.342080384136 | 1965 | 74.567673137954 | 1964 | 74.799237443719 | 1963 | 75.249759362327 | 1962 | 75.692523175659 | 1961 | 76.163085755309 | 1960 | 76.654122033455 |
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