Year | Value | 2022 | 50.915066454082 | 2021 | 50.913597114244 | 2020 | 50.906916701466 | 2019 | 50.911385825509 | 2018 | 50.924442533195 | 2017 | 50.940654299252 | 2016 | 50.958768715472 | 2015 | 50.980153711844 | 2014 | 51.003014851027 | 2013 | 51.025700043773 | 2012 | 51.049653209898 | 2011 | 51.074372828452 | 2010 | 51.088356952767 | 2009 | 51.092123198388 | 2008 | 51.09726866611 | 2007 | 51.104684640129 | 2006 | 51.111277847188 | 2005 | 51.116551053337 | 2004 | 51.120946095002 | 2003 | 51.123790944335 | 2002 | 51.123362696686 | 2001 | 51.121702494622 | 2000 | 51.124077283441 | 1999 | 51.131830963244 | 1998 | 51.14005373033 | 1997 | 51.146686292871 | 1996 | 51.153240667687 | 1995 | 51.160795909219 | 1994 | 51.169616371796 | 1993 | 51.179312516259 | 1992 | 51.190112035297 | 1991 | 51.204084818294 | 1990 | 51.219826803473 | 1989 | 51.235544281868 | 1988 | 51.250167817511 | 1987 | 51.262554363578 | 1986 | 51.274553519688 | 1985 | 51.285442374213 | 1984 | 51.293005694183 | 1983 | 51.299416900492 | 1982 | 51.305289312627 | 1981 | 51.309924449952 | 1980 | 51.316587445069 | 1979 | 51.321099550363 | 1978 | 51.319083912912 | 1977 | 51.314928585018 | 1976 | 51.313342758624 | 1975 | 51.314176531823 | 1974 | 51.319937316736 | 1973 | 51.329989381294 | 1972 | 51.342763625513 | 1971 | 51.362480821262 | 1970 | 51.384659941378 | 1969 | 51.39773077694 | 1968 | 51.402526088642 | 1967 | 51.397179647515 | 1966 | 51.383981138883 | 1965 | 51.375203084804 | 1964 | 51.379044735629 | 1963 | 51.390682146873 | 1962 | 51.402604098314 | 1961 | 51.413830820601 | 1960 | 51.426089801171 |
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