Year | Value | 2022 | 46.506 | 2021 | 47.002 | 2020 | 47.484 | 2019 | 47.952 | 2018 | 48.407 | 2017 | 48.847 | 2016 | 49.272 | 2015 | 49.683 | 2014 | 50.079 | 2013 | 50.459 | 2012 | 50.825 | 2011 | 51.175 | 2010 | 51.509 | 2009 | 51.828 | 2008 | 52.132 | 2007 | 52.419 | 2006 | 52.692 | 2005 | 52.948 | 2004 | 53.188 | 2003 | 53.413 | 2002 | 53.638 | 2001 | 53.863 | 2000 | 54.087 | 1999 | 54.311 | 1998 | 54.535 | 1997 | 54.759 | 1996 | 54.982 | 1995 | 55.206 | 1994 | 55.266 | 1993 | 55.181 | 1992 | 55.096 | 1991 | 55.01 | 1990 | 54.925 | 1989 | 54.84 | 1988 | 54.683 | 1987 | 54.463 | 1986 | 54.243 | 1985 | 54.024 | 1984 | 53.804 | 1983 | 53.583 | 1982 | 53.363 | 1981 | 53.142 | 1980 | 52.922 | 1979 | 52.701 | 1978 | 52.576 | 1977 | 52.531 | 1976 | 52.487 | 1975 | 52.443 | 1974 | 52.398 | 1973 | 52.354 | 1972 | 52.309 | 1971 | 52.265 | 1970 | 52.22 | 1969 | 52.279 | 1968 | 52.425 | 1967 | 52.57 | 1966 | 52.716 | 1965 | 52.861 | 1964 | 53.007 | 1963 | 53.152 | 1962 | 53.298 | 1961 | 53.443 | 1960 | 53.588 |
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