Year | Value | 2022 | 0.68037258105701 | 2021 | 0.79721609389813 | 2020 | 0.95522085775158 | 2019 | 1.025310771871 | 2018 | 1.0875277215785 | 2017 | 1.1556244906765 | 2016 | 1.185046229068 | 2015 | 1.1877953200507 | 2014 | 1.2403621838269 | 2013 | 1.2975488353917 | 2012 | 1.3321920498149 | 2011 | 1.3615880845334 | 2010 | 1.3775958115977 | 2009 | 1.3911949303375 | 2008 | 1.4223915088358 | 2007 | 1.466371750015 | 2006 | 1.5243079604101 | 2005 | 1.6041291692793 | 2004 | 1.6728108702288 | 2003 | 1.724269032267 | 2002 | 1.7767678741813 | 2001 | 1.8084464212375 | 2000 | 1.8221840021802 | 1999 | 1.8493332514954 | 1998 | 1.8875578646817 | 1997 | 1.9192625952832 | 1996 | 1.9514355014452 | 1995 | 1.9918712290206 | 1994 | 2.0208560198765 | 1993 | 2.0478373609396 | 1992 | 2.0743442447235 | 1991 | 2.1018910536268 | 1990 | 2.141140538905 | 1989 | 2.1692174813666 | 1988 | 2.184281790986 | 1987 | 2.2109460301296 | 1986 | 2.235271247379 | 1985 | 2.2483624013224 | 1984 | 2.2627550515706 | 1983 | 2.2586892462292 | 1982 | 2.260807779452 | 1981 | 2.2758929916156 | 1980 | 2.2612188534673 | 1979 | 2.2235340611471 | 1978 | 2.2129351781936 | 1977 | 2.2084165870987 | 1976 | 2.2090506141865 | 1975 | 2.2384572772445 | 1974 | 2.2582043807987 | 1973 | 2.2511763068725 | 1972 | 2.2274309618947 | 1971 | 2.2170081758455 | 1970 | 2.2101832771281 | 1969 | 2.2031572336638 | 1968 | 2.1688616310763 | 1967 | 2.1287673586727 | 1966 | 2.1518377682266 | 1965 | 2.235299585731 | 1964 | 2.3011917955996 | 1963 | 2.3090788996613 | 1962 | 2.3116891632 | 1961 | 2.3047063807482 |
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