Year | Value | 2021 | 10.190814210915 | 2020 | 10.190814210915 | 2019 | 10.190814210915 | 2018 | 10.190814210915 | 2017 | 10.190814210915 | 2016 | 10.190814210915 | 2015 | 10.190814210915 | 2014 | 10.190814210915 | 2013 | 10.190814210915 | 2012 | 10.190814210915 | 2011 | 10.190814210915 | 2010 | 9.6637031310398 | 2009 | 9.6637031310398 | 2008 | 9.3122957444566 | 2007 | 9.3122957444566 | 2006 | 9.3298661137857 | 2005 | 9.2490424148716 | 2004 | 9.2385001932741 | 2003 | 9.0417120567874 | 2002 | 8.945075025477 | 2001 | 9.0100853919949 | 2000 | 8.5936676388938 | 1999 | 8.9538602101416 | 1998 | 8.2194187721826 | 1997 | 8.4583757950592 | 1996 | 8.2071195136522 | 1995 | 9.554766841199 | 1994 | 9.5793653582598 | 1993 | 8.8906068805566 | 1992 | 9.2982394489932 | 1991 | 8.9556172470745 | 1990 | 8.7676142952525 | 1989 | 9.2648557472678 | 1988 | 8.5778543064975 | 1987 | 8.1790069227255 | 1986 | 8.0700706328847 | 1985 | 8.0366869311593 | 1984 | 6.5449625751133 | 1983 | 6.676740345082 | 1982 | 6.676740345082 | 1981 | 6.676740345082 | 1980 | 6.676740345082 | 1979 | 6.676740345082 | 1978 | 6.676740345082 | 1977 | 6.676740345082 | 1976 | 6.676740345082 | 1975 | 6.676740345082 | 1974 | 6.1496292652071 | 1973 | 6.1496292652071 | 1972 | 6.1496292652071 | 1971 | 6.1496292652071 | 1970 | 6.1496292652071 | 1969 | 6.1496292652071 | 1968 | 6.1496292652071 | 1967 | 6.1496292652071 | 1966 | 6.1496292652071 | 1965 | 6.1496292652071 | 1964 | 6.1496292652071 | 1963 | 6.1496292652071 | 1962 | 6.1496292652071 | 1961 | 6.1496292652071 |
|