Year | Value | 2022 | 53.494 | 2021 | 52.998 | 2020 | 52.516 | 2019 | 52.048 | 2018 | 51.593 | 2017 | 51.153 | 2016 | 50.728 | 2015 | 50.317 | 2014 | 49.921 | 2013 | 49.541 | 2012 | 49.175 | 2011 | 48.825 | 2010 | 48.491 | 2009 | 48.172 | 2008 | 47.868 | 2007 | 47.581 | 2006 | 47.308 | 2005 | 47.052 | 2004 | 46.812 | 2003 | 46.587 | 2002 | 46.362 | 2001 | 46.137 | 2000 | 45.913 | 1999 | 45.689 | 1998 | 45.465 | 1997 | 45.241 | 1996 | 45.018 | 1995 | 44.794 | 1994 | 44.734 | 1993 | 44.819 | 1992 | 44.904 | 1991 | 44.99 | 1990 | 45.075 | 1989 | 45.16 | 1988 | 45.317 | 1987 | 45.537 | 1986 | 45.757 | 1985 | 45.976 | 1984 | 46.196 | 1983 | 46.417 | 1982 | 46.637 | 1981 | 46.858 | 1980 | 47.078 | 1979 | 47.299 | 1978 | 47.424 | 1977 | 47.469 | 1976 | 47.513 | 1975 | 47.557 | 1974 | 47.602 | 1973 | 47.646 | 1972 | 47.691 | 1971 | 47.735 | 1970 | 47.78 | 1969 | 47.721 | 1968 | 47.575 | 1967 | 47.43 | 1966 | 47.284 | 1965 | 47.139 | 1964 | 46.993 | 1963 | 46.848 | 1962 | 46.702 | 1961 | 46.557 | 1960 | 46.412 |
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