Year | Value | 2021 | 14.952471273241 | 2020 | 14.951147967623 | 2019 | 14.922476345912 | 2018 | 14.818376304007 | 2017 | 14.697955492821 | 2016 | 14.411680377583 | 2015 | 14.313755761893 | 2014 | 14.225094285525 | 2013 | 13.863831851966 | 2012 | 13.623872433338 | 2011 | 13.072495092742 | 2010 | 12.540085132661 | 2009 | 11.859906045301 | 2008 | 11.33631812267 | 2007 | 11.314263029047 | 2006 | 11.286032509208 | 2005 | 11.270152841799 | 2004 | 11.270152841799 | 2003 | 11.270152841799 | 2002 | 11.270152841799 | 2001 | 11.270152841799 | 2000 | 11.292207935423 | 1999 | 11.292207935423 | 1998 | 11.33631812267 | 1997 | 11.33631812267 | 1996 | 11.380428309918 | 1995 | 11.380428309918 | 1994 | 11.468648684414 | 1993 | 11.468648684414 | 1992 | 11.468648684414 | 1991 | 11.459826646964 | 1990 | 11.451004609515 | 1989 | 11.44659359079 | 1988 | 11.44659359079 | 1987 | 11.44659359079 | 1986 | 11.44659359079 | 1985 | 11.424538497166 | 1984 | 11.402483403542 | 1983 | 11.380428309918 | 1982 | 11.367195253744 | 1981 | 11.358373216294 | 1980 | 11.33631812267 | 1979 | 11.314263029047 | 1978 | 11.314263029047 | 1977 | 11.305440991597 | 1976 | 11.292207935423 | 1975 | 11.270152841799 | 1974 | 11.270152841799 | 1973 | 11.248097748175 | 1972 | 11.226042654551 | 1971 | 11.203987560927 | 1970 | 11.181932467303 | 1969 | 11.159877373679 | 1968 | 11.137822280056 | 1967 | 11.115767186432 | 1966 | 11.102534130257 | 1965 | 11.093712092808 | 1964 | 11.084890055358 | 1963 | 11.071656999184 | 1962 | 11.05842394301 | 1961 | 11.04960190556 |
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