Year | Value | 2022 | 37.160250066486 | 2021 | 37.310004431347 | 2020 | 37.438545756893 | 2019 | 37.561860786898 | 2018 | 37.666333396415 | 2017 | 37.751545270737 | 2016 | 37.815515677007 | 2015 | 37.859327541792 | 2014 | 37.886354857226 | 2013 | 37.903186263321 | 2012 | 37.918223026113 | 2011 | 37.936065514769 | 2010 | 37.97393497558 | 2009 | 38.013953123991 | 2008 | 38.07545945338 | 2007 | 38.158154571233 | 2006 | 38.236104554473 | 2005 | 38.29730777581 | 2004 | 38.351818950942 | 2003 | 38.397844308008 | 2002 | 38.444239252801 | 2001 | 38.5045466989 | 2000 | 38.523812642502 | 1999 | 38.494930211401 | 1998 | 38.465981766475 | 1997 | 38.436822055696 | 1996 | 38.412752342447 | 1995 | 38.39076938744 | 1994 | 38.363246398484 | 1993 | 38.334761348438 | 1992 | 38.30658066693 | 1991 | 38.396687630601 | 1990 | 38.608151089492 | 1989 | 38.816860711331 | 1988 | 39.108272614994 | 1987 | 39.490332679468 | 1986 | 39.868890497525 | 1985 | 40.253292144687 | 1984 | 40.647422266912 | 1983 | 41.044655114534 | 1982 | 41.44136748219 | 1981 | 41.836046137824 | 1980 | 42.293875477303 | 1979 | 42.895942065001 | 1978 | 43.56572364021 | 1977 | 44.294932265398 | 1976 | 45.00774554033 | 1975 | 45.705533819203 | 1974 | 46.414569946036 | 1973 | 47.134041668127 | 1972 | 47.853531009073 | 1971 | 48.57334382658 | 1970 | 49.219723813236 | 1969 | 49.784847086154 | 1968 | 50.361496060123 | 1967 | 50.932193541767 | 1966 | 51.49460372128 | 1965 | 52.118869966581 | 1964 | 52.790306145517 | 1963 | 53.465079107744 | 1962 | 54.132631481507 | 1961 | 54.792661926257 | 1960 | 55.49210728561 |
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