Year | Value | 2022 | 44.052 | 2021 | 43.866 | 2020 | 43.697 | 2019 | 43.546 | 2018 | 43.411 | 2017 | 43.293 | 2016 | 43.192 | 2015 | 43.108 | 2014 | 43.041 | 2013 | 42.99 | 2012 | 42.957 | 2011 | 42.94 | 2010 | 43.059 | 2009 | 43.421 | 2008 | 43.783 | 2007 | 44.147 | 2006 | 44.511 | 2005 | 44.875 | 2004 | 45.24 | 2003 | 45.606 | 2002 | 45.972 | 2001 | 46.339 | 2000 | 46.717 | 1999 | 47.127 | 1998 | 47.536 | 1997 | 47.946 | 1996 | 48.356 | 1995 | 48.767 | 1994 | 49.177 | 1993 | 49.588 | 1992 | 49.998 | 1991 | 50.304 | 1990 | 50.319 | 1989 | 50.335 | 1988 | 50.35 | 1987 | 50.365 | 1986 | 50.38 | 1985 | 50.395 | 1984 | 50.411 | 1983 | 50.426 | 1982 | 50.441 | 1981 | 50.456 | 1980 | 50.472 | 1979 | 50.487 | 1978 | 50.502 | 1977 | 50.517 | 1976 | 50.532 | 1975 | 50.548 | 1974 | 50.563 | 1973 | 50.578 | 1972 | 50.593 | 1971 | 50.609 | 1970 | 50.624 | 1969 | 50.639 | 1968 | 50.654 | 1967 | 50.67 | 1966 | 50.685 | 1965 | 50.7 | 1964 | 50.715 | 1963 | 50.73 | 1962 | 50.746 | 1961 | 50.761 | 1960 | 50.776 |
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