Year | Value | 2021 | 10.253164556962 | 2020 | 10.31847133758 | 2019 | 10.384615384615 | 2018 | 10.411311053985 | 2017 | 10.397435897436 | 2016 | 10.551989730424 | 2015 | 10.694087403599 | 2014 | 10.933852140078 | 2013 | 11.077922077922 | 2012 | 11.220779220779 | 2011 | 11.395045632334 | 2010 | 11.614173228347 | 2009 | 11.776315789474 | 2008 | 11.921052631579 | 2007 | 12.213333333333 | 2006 | 12.527027027027 | 2005 | 12.662162162162 | 2004 | 12.986301369863 | 2003 | 13.305555555556 | 2002 | 13.647887323944 | 2001 | 13.788732394366 | 2000 | 13.943661971831 | 1999 | 14.084507042254 | 1998 | 14.084507042254 | 1997 | 14.084507042254 | 1996 | 14.084507042254 | 1995 | 14.084507042254 | 1994 | 14.084507042254 | 1993 | 14.084507042254 | 1992 | 14.084507042254 | 1991 | 14.492753623188 | 1990 | 14.492753623188 | 1989 | 14.492753623188 | 1988 | 14.492753623188 | 1987 | 14.492753623188 | 1986 | 14.492753623188 | 1985 | 14.492753623188 | 1984 | 14.492753623188 | 1983 | 14.492753623188 | 1982 | 14.492753623188 | 1981 | 14.492753623188 | 1980 | 14.492753623188 | 1979 | 14.492753623188 | 1978 | 14.492753623188 | 1977 | 14.492753623188 | 1976 | 14.492753623188 | 1975 | 14.492753623188 | 1974 | 14.492753623188 | 1973 | 14.492753623188 | 1972 | 14.492753623188 | 1971 | 14.492753623188 | 1970 | 14.492753623188 | 1969 | 14.492753623188 | 1968 | 14.492753623188 | 1967 | 14.492753623188 | 1966 | 14.492753623188 | 1965 | 14.492753623188 | 1964 | 14.492753623188 | 1963 | 14.492753623188 | 1962 | 14.492753623188 | 1961 | 14.492753623188 |
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