Year | Value | 2021 | 58.935 | 2020 | 60.372 | 2019 | 60.678 | 2018 | 60.288 | 2017 | 60.093 | 2016 | 60.149 | 2015 | 59.693 | 2014 | 59.689 | 2013 | 59.576 | 2012 | 59.169 | 2011 | 59.095 | 2010 | 58.902 | 2009 | 58.521 | 2008 | 57.973 | 2007 | 57.473 | 2006 | 56.805 | 2005 | 56.107 | 2004 | 55.225 | 2003 | 54.471 | 2002 | 53.86 | 2001 | 53.341 | 2000 | 53.162 | 1999 | 53.009 | 1998 | 52.919 | 1997 | 53.053 | 1996 | 53.326 | 1995 | 53.767 | 1994 | 54.311 | 1993 | 54.593 | 1992 | 55.138 | 1991 | 56.038 | 1990 | 56.744 | 1989 | 57.337 | 1988 | 57.826 | 1987 | 58.437 | 1986 | 58.639 | 1985 | 58.851 | 1984 | 59.163 | 1983 | 59.298 | 1982 | 59.014 | 1981 | 58.992 | 1980 | 57.05 | 1979 | 56.148 | 1978 | 55.212 | 1977 | 54.877 | 1976 | 54.504 | 1975 | 54.657 | 1974 | 54.125 | 1973 | 53.989 | 1972 | 53.16 | 1971 | 52.547 | 1970 | 52.096 | 1969 | 51.729 | 1968 | 51.309 | 1967 | 51.067 | 1966 | 50.693 | 1965 | 50.261 | 1964 | 49.922 | 1963 | 49.394 | 1962 | 48.827 | 1961 | 48.127 | 1960 | 47.289 |
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