Year | Value | 2023 | 10.852 | 2022 | 10.942 | 2021 | 11.023 | 2020 | 11.115 | 2019 | 11.195 | 2018 | 11.263 | 2017 | 11.421 | 2016 | 11.983 | 2015 | 12.607 | 2014 | 13.503 | 2013 | 13.902 | 2012 | 14.075 | 2011 | 14.273 | 2010 | 14.565 | 2009 | 15.918 | 2008 | 15.831 | 2007 | 16.125 | 2006 | 16.028 | 2005 | 16.086 | 2004 | 15.967 | 2003 | 16.024 | 2002 | 16.299 | 2001 | 16.787 | 2000 | 17.254 | 1999 | 18.061 | 1998 | 19.076 | 1997 | 19.768 | 1996 | 20.44 | 1995 | 21.147 | 1994 | 21.711 | 1993 | 23.007 | 1992 | 23.94 | 1991 | 22.175 | 1990 | 22.208 | 1989 | 22.077 | 1988 | 21.869 | 1987 | 21.663 | 1986 | 21.488 | 1985 | 21.336 | 1984 | 21.433 | 1983 | 21.648 | 1982 | 21.834 | 1981 | 22.075 | 1980 | 22.346 | 1979 | 22.866 | 1978 | 23.562 | 1977 | 24.293 | 1976 | 25.181 | 1975 | 26.102 |
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