Year | Value | 2022 | 48.327023907138 | 2021 | 48.290956209956 | 2020 | 48.22481477582 | 2019 | 48.159895340334 | 2018 | 48.132713040341 | 2017 | 48.121550202735 | 2016 | 48.129499200299 | 2015 | 48.169823236936 | 2014 | 48.203742678168 | 2013 | 48.211484948397 | 2012 | 48.219409517652 | 2011 | 48.232505692598 | 2010 | 48.247355058579 | 2009 | 48.286353704659 | 2008 | 48.369588200436 | 2007 | 48.472226441144 | 2006 | 48.573866273549 | 2005 | 48.64865941388 | 2004 | 48.677214448912 | 2003 | 48.686659558035 | 2002 | 48.696354877027 | 2001 | 48.69907347832 | 2000 | 48.699456586162 | 1999 | 48.703007382249 | 1998 | 48.710595033159 | 1997 | 48.726851107444 | 1996 | 48.750384571208 | 1995 | 48.765033540887 | 1994 | 48.775414803083 | 1993 | 48.794789517867 | 1992 | 48.81781755931 | 1991 | 48.842129852638 | 1990 | 48.853765059489 | 1989 | 48.854430274584 | 1988 | 48.868024408962 | 1987 | 48.875994558032 | 1986 | 48.880469206086 | 1985 | 48.886346688028 | 1984 | 48.892717826531 | 1983 | 48.895493050728 | 1982 | 48.894049355727 | 1981 | 48.935470561503 | 1980 | 48.99795473252 | 1979 | 49.034974105277 | 1978 | 49.080094813072 | 1977 | 49.12937696923 | 1976 | 49.169456882551 | 1975 | 49.201909236419 | 1974 | 49.224893925359 | 1973 | 49.23230263892 | 1972 | 49.238711236751 | 1971 | 49.249557937973 | 1970 | 49.260875995337 | 1969 | 49.270491131959 | 1968 | 49.279705686751 | 1967 | 49.28638755724 | 1966 | 49.289451554868 | 1965 | 49.307895769584 | 1964 | 49.34162442696 | 1963 | 49.371940552739 | 1962 | 49.397991205169 | 1961 | 49.422678688485 | 1960 | 49.437612521719 |
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