Year | Value | 2023 | 8.245 | 2022 | 8.38 | 2021 | 8.544 | 2020 | 8.792 | 2019 | 9.056 | 2018 | 9.4 | 2017 | 9.765 | 2016 | 10.111 | 2015 | 10.594 | 2014 | 10.95 | 2013 | 11.367 | 2012 | 11.758 | 2011 | 11.943 | 2010 | 12.009 | 2009 | 12.188 | 2008 | 12.525 | 2007 | 12.926 | 2006 | 13.208 | 2005 | 13.488 | 2004 | 13.82 | 2003 | 14.053 | 2002 | 14.335 | 2001 | 14.665 | 2000 | 15.027 | 1999 | 15.585 | 1998 | 16.277 | 1997 | 16.83 | 1996 | 17.254 | 1995 | 17.676 | 1994 | 18.238 | 1993 | 18.744 | 1992 | 19.19 | 1991 | 19.452 | 1990 | 19.622 | 1989 | 20.149 | 1988 | 20.243 | 1987 | 20.721 | 1986 | 21.281 | 1985 | 21.651 | 1984 | 22.33 | 1983 | 23.304 | 1982 | 24.457 | 1981 | 25.532 | 1980 | 26.279 | 1979 | 26.79 | 1978 | 27.455 | 1977 | 28.588 | 1976 | 29.846 | 1975 | 31.095 |
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