Year | Value | 2021 | 65.865 | 2020 | 65.392 | 2019 | 65.552 | 2018 | 65.408 | 2017 | 65.593 | 2016 | 65.538 | 2015 | 65.396 | 2014 | 65.219 | 2013 | 65.484 | 2012 | 65.496 | 2011 | 65.226 | 2010 | 64.937 | 2009 | 64.586 | 2008 | 64.01 | 2007 | 63.368 | 2006 | 62.908 | 2005 | 62.56 | 2004 | 62.418 | 2003 | 62.178 | 2002 | 61.847 | 2001 | 61.571 | 2000 | 61.326 | 1999 | 60.809 | 1998 | 60.466 | 1997 | 60.026 | 1996 | 60.028 | 1995 | 60.023 | 1994 | 60.197 | 1993 | 60.291 | 1992 | 60.39 | 1991 | 60.659 | 1990 | 60.58 | 1989 | 60.531 | 1988 | 60.395 | 1987 | 60.169 | 1986 | 59.719 | 1985 | 59.16 | 1984 | 58.838 | 1983 | 58.509 | 1982 | 58.141 | 1981 | 58.044 | 1980 | 57.621 | 1979 | 57.203 | 1978 | 56.907 | 1977 | 56.532 | 1976 | 56.334 | 1975 | 55.942 | 1974 | 55.75 | 1973 | 55.31 | 1972 | 54.875 | 1971 | 54.538 | 1970 | 54.058 | 1969 | 53.576 | 1968 | 53.088 | 1967 | 52.662 | 1966 | 52.223 | 1965 | 51.835 | 1964 | 51.442 | 1963 | 51.078 | 1962 | 50.594 | 1961 | 50.194 | 1960 | 49.697 |
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