Year | Value | 2022 | 49.654227996329 | 2021 | 49.643517762684 | 2020 | 49.632677313084 | 2019 | 49.626458843577 | 2018 | 49.624341798207 | 2017 | 49.623449405368 | 2016 | 49.6239387758 | 2015 | 49.625097605302 | 2014 | 49.62683120951 | 2013 | 49.627104302905 | 2012 | 49.62907301434 | 2011 | 49.635173368909 | 2010 | 49.64159076456 | 2009 | 49.645551956295 | 2008 | 49.649785405178 | 2007 | 49.656278471823 | 2006 | 49.660644421217 | 2005 | 49.665699386549 | 2004 | 49.675669621651 | 2003 | 49.683754205961 | 2002 | 49.690706805329 | 2001 | 49.698466145447 | 2000 | 49.706300093649 | 1999 | 49.714159795042 | 1998 | 49.722799714798 | 1997 | 49.733661336007 | 1996 | 49.744842912552 | 1995 | 49.757268796419 | 1994 | 49.770526924347 | 1993 | 49.783089921367 | 1992 | 49.796770142575 | 1991 | 49.813978897464 | 1990 | 49.830453330243 | 1989 | 49.845740556478 | 1988 | 49.862021123501 | 1987 | 49.880550783171 | 1986 | 49.899089351989 | 1985 | 49.917456057841 | 1984 | 49.937732533535 | 1983 | 49.956667778046 | 1982 | 49.974952434363 | 1981 | 49.993519851429 | 1980 | 50.009215999212 | 1979 | 50.022507295044 | 1978 | 50.034002599798 | 1977 | 50.04283428141 | 1976 | 50.050324103611 | 1975 | 50.05823155846 | 1974 | 50.066718409654 | 1973 | 50.074914365884 | 1972 | 50.08276960428 | 1971 | 50.08993669344 | 1970 | 50.097033375298 | 1969 | 50.105282027487 | 1968 | 50.114088287436 | 1967 | 50.123512681056 | 1966 | 50.129023826078 | 1965 | 50.090802625457 | 1964 | 50.056754462001 | 1963 | 50.071027204192 | 1962 | 50.089100717015 | 1961 | 50.106542900621 | 1960 | 50.121511653371 |
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