Year | Value | 2022 | 52.023 | 2021 | 52.316 | 2020 | 52.592 | 2019 | 52.851 | 2018 | 53.093 | 2017 | 53.318 | 2016 | 53.525 | 2015 | 53.716 | 2014 | 53.907 | 2013 | 54.097 | 2012 | 54.288 | 2011 | 54.478 | 2010 | 54.668 | 2009 | 54.629 | 2008 | 54.545 | 2007 | 54.46 | 2006 | 54.375 | 2005 | 54.29 | 2004 | 54.205 | 2003 | 54.12 | 2002 | 54.035 | 2001 | 53.95 | 2000 | 53.865 | 1999 | 53.78 | 1998 | 53.695 | 1997 | 53.61 | 1996 | 53.525 | 1995 | 53.44 | 1994 | 53.355 | 1993 | 53.27 | 1992 | 53.185 | 1991 | 53.099 | 1990 | 53.014 | 1989 | 53.828 | 1988 | 54.817 | 1987 | 55.805 | 1986 | 56.788 | 1985 | 57.765 | 1984 | 58.734 | 1983 | 59.7 | 1982 | 60.657 | 1981 | 61.606 | 1980 | 62.544 | 1979 | 63.003 | 1978 | 63.365 | 1977 | 63.725 | 1976 | 64.083 | 1975 | 64.44 | 1974 | 64.941 | 1973 | 65.467 | 1972 | 65.988 | 1971 | 66.507 | 1970 | 67.021 | 1969 | 67.328 | 1968 | 67.597 | 1967 | 67.865 | 1966 | 68.131 | 1965 | 68.396 | 1964 | 68.66 | 1963 | 68.923 | 1962 | 69.184 | 1961 | 69.445 | 1960 | 69.703 |
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