Year | Value | 2021 | 14.745029647715 | 2020 | 14.745029647715 | 2019 | 14.745029647715 | 2018 | 14.745029647715 | 2017 | 14.745029647715 | 2016 | 14.745029647715 | 2015 | 14.745029647715 | 2014 | 14.745029647715 | 2013 | 14.747122427625 | 2012 | 14.775026159749 | 2011 | 15.086850366237 | 2010 | 15.207534007673 | 2009 | 15.347052668294 | 2008 | 15.486571328915 | 2007 | 15.626089989536 | 2006 | 15.765608650157 | 2005 | 15.905127310778 | 2004 | 16.044645971399 | 2003 | 16.149284966864 | 2002 | 16.288803627485 | 2001 | 16.428322288106 | 2000 | 16.421346355075 | 1999 | 16.436363636364 | 1998 | 16.413286713287 | 1997 | 16.39020979021 | 1996 | 16.367132867133 | 1995 | 16.344055944056 | 1994 | 16.320979020979 | 1993 | 16.297902097902 | 1992 | 16.274825174825 | 1991 | 16.251748251748 | 1990 | 16.226573426573 | 1989 | 16.201398601399 | 1988 | 16.176223776224 | 1987 | 16.151048951049 | 1986 | 16.125874125874 | 1985 | 16.100699300699 | 1984 | 16.075524475524 | 1983 | 16.05034965035 | 1982 | 16.025174825175 | 1981 | 16 | 1980 | 15.874125874126 | 1979 | 15.769230769231 | 1978 | 15.664335664336 | 1977 | 15.559440559441 | 1976 | 15.454545454545 | 1975 | 15.34965034965 | 1974 | 15.244755244755 | 1973 | 15.13986013986 | 1972 | 14.370629370629 | 1971 | 13.657342657343 | 1970 | 13.657342657343 | 1969 | 12.72027972028 | 1968 | 12.72027972028 | 1967 | 12.72027972028 | 1966 | 12.629370629371 | 1965 | 12.629370629371 | 1964 | 12.629370629371 | 1963 | 12.699300699301 | 1962 | 12.629370629371 | 1961 | 12.629370629371 |
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