Year | Value | 2022 | 42.54424102578 | 2021 | 43.110091275826 | 2020 | 43.694328059034 | 2019 | 44.281840133785 | 2018 | 44.880294973355 | 2017 | 45.486903296791 | 2016 | 46.100092982874 | 2015 | 46.718484261016 | 2014 | 47.345917180123 | 2013 | 47.976226158343 | 2012 | 48.598691165287 | 2011 | 49.212595360704 | 2010 | 49.83633075726 | 2009 | 50.487068685043 | 2008 | 51.141340428088 | 2007 | 51.794674018807 | 2006 | 52.44236964563 | 2005 | 53.09825881492 | 2004 | 53.765280215365 | 2003 | 54.425944055972 | 2002 | 55.076842305526 | 2001 | 55.719494435082 | 2000 | 56.309724587394 | 1999 | 56.85095374409 | 1998 | 57.381734794618 | 1997 | 57.906838443694 | 1996 | 58.423078448814 | 1995 | 58.933405145661 | 1994 | 59.441562267676 | 1993 | 59.950049261743 | 1992 | 60.45429990544 | 1991 | 60.957335622298 | 1990 | 61.462532582196 | 1989 | 61.947712505469 | 1988 | 62.448900894275 | 1987 | 62.966612616459 | 1986 | 63.487419686335 | 1985 | 64.015898896135 | 1984 | 64.549694418128 | 1983 | 65.085500405544 | 1982 | 65.606898554263 | 1981 | 66.179540065817 | 1980 | 66.772587027633 | 1979 | 67.353699689864 | 1978 | 67.929061535311 | 1977 | 68.397743666331 | 1976 | 68.762542504437 | 1975 | 69.120073259496 | 1974 | 69.481086032839 | 1973 | 69.829402784716 | 1972 | 70.130510719649 | 1971 | 70.387689994842 | 1970 | 70.601970505418 | 1969 | 70.805687047231 | 1968 | 71.016135562505 | 1967 | 71.237815142086 | 1966 | 71.464041884295 | 1965 | 71.675634195861 | 1964 | 71.898172051473 | 1963 | 72.381970203947 | 1962 | 72.856696484193 | 1961 | 73.3824464856 | 1960 | 73.952523558276 |
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