Year | Value | 2021 | 10.067286652079 | 2020 | 10.067286652079 | 2019 | 10.067286652079 | 2018 | 10.067286652079 | 2017 | 10.067286652079 | 2016 | 10.067286652079 | 2015 | 10.067286652079 | 2014 | 10.050875273523 | 2013 | 10.050875273523 | 2012 | 10.067505470459 | 2011 | 10.410284463895 | 2010 | 10.864332603939 | 2009 | 11.247264770241 | 2008 | 11.520787746171 | 2007 | 11.931072210066 | 2006 | 12.286652078775 | 2005 | 12.587527352298 | 2004 | 12.943107221007 | 2003 | 13.326039387308 | 2002 | 13.676148796499 | 2001 | 13.566739606127 | 2000 | 13.402625820569 | 1999 | 13.293216630197 | 1998 | 13.129102844639 | 1997 | 13.019693654267 | 1996 | 12.855579868709 | 1995 | 12.746170678337 | 1994 | 12.636761487965 | 1993 | 12.582056892779 | 1992 | 12.582056892779 | 1991 | 12.527352297593 | 1990 | 12.691466083151 | 1989 | 12.910284463895 | 1988 | 13.457330415755 | 1987 | 14.004376367615 | 1986 | 14.606126914661 | 1985 | 15.207877461707 | 1984 | 15.864332603939 | 1983 | 15.317286652079 | 1982 | 14.879649890591 | 1981 | 14.496717724289 | 1980 | 14.496717724289 | 1979 | 14.496717724289 | 1978 | 14.496717724289 | 1977 | 14.496717724289 | 1976 | 14.496717724289 | 1975 | 14.442013129103 | 1974 | 14.442013129103 | 1973 | 14.442013129103 | 1972 | 14.442013129103 | 1971 | 14.387308533917 | 1970 | 14.387308533917 | 1969 | 14.387308533917 | 1968 | 14.387308533917 | 1967 | 14.332603938731 | 1966 | 14.332603938731 | 1965 | 14.332603938731 | 1964 | 14.332603938731 | 1963 | 14.277899343545 | 1962 | 14.277899343545 | 1961 | 14.277899343545 |
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