Year | Value | 2022 | 46.921032038299 | 2021 | 46.938933043211 | 2020 | 46.970720837283 | 2019 | 47.066162587979 | 2018 | 47.15963815168 | 2017 | 47.257085321378 | 2016 | 47.36248340482 | 2015 | 47.476509128973 | 2014 | 47.598097876912 | 2013 | 47.726560314405 | 2012 | 47.859861419506 | 2011 | 47.952112335662 | 2010 | 47.973701634855 | 2009 | 47.968678927703 | 2008 | 47.959881898843 | 2007 | 47.954708633303 | 2006 | 47.960897695188 | 2005 | 47.966411457598 | 2004 | 47.968473005852 | 2003 | 47.970631284687 | 2002 | 47.974380928024 | 2001 | 47.999189291359 | 2000 | 48.053466575287 | 1999 | 48.11993852199 | 1998 | 48.184948516629 | 1997 | 48.24168083556 | 1996 | 48.295188932888 | 1995 | 48.348506584039 | 1994 | 48.40256289563 | 1993 | 48.45920275694 | 1992 | 48.516260708435 | 1991 | 48.603990176329 | 1990 | 48.742672609479 | 1989 | 48.906431569711 | 1988 | 49.084375520066 | 1987 | 49.278722803777 | 1986 | 49.491303578405 | 1985 | 49.72540841154 | 1984 | 49.981018905171 | 1983 | 50.258588635621 | 1982 | 50.560594019292 | 1981 | 50.855867629023 | 1980 | 51.025956662808 | 1979 | 51.086093524155 | 1978 | 51.140834308753 | 1977 | 51.190519672896 | 1976 | 51.239960918021 | 1975 | 51.290909164544 | 1974 | 51.342607570366 | 1973 | 51.393248815759 | 1972 | 51.444289396748 | 1971 | 51.49500464312 | 1970 | 51.434787531745 | 1969 | 51.264474910156 | 1968 | 51.100979268361 | 1967 | 50.942700676435 | 1966 | 50.783954481844 | 1965 | 50.620705473103 | 1964 | 50.4459231304 | 1963 | 50.255141567416 | 1962 | 50.045958105558 | 1961 | 49.818102444703 | 1960 | 49.800580745026 |
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