Year | Value | 2024 | 11.984 | 2023 | 12.212 | 2022 | 12.445 | 2021 | 12.683 | 2020 | 12.927 | 2019 | 13.176 | 2018 | 13.431 | 2017 | 13.691 | 2016 | 13.958 | 2015 | 14.23 | 2014 | 14.508 | 2013 | 14.791 | 2012 | 15.077 | 2011 | 15.369 | 2010 | 15.665 | 2009 | 15.956 | 2008 | 16.251 | 2007 | 16.552 | 2006 | 16.857 | 2005 | 17.166 | 2004 | 17.479 | 2003 | 17.797 | 2002 | 18.12 | 2001 | 18.447 | 2000 | 18.808 | 1999 | 19.504 | 1998 | 20.219 | 1997 | 20.952 | 1996 | 21.698 | 1995 | 22.39 | 1994 | 23.097 | 1993 | 23.819 | 1992 | 24.556 | 1991 | 25.31 | 1990 | 26.078 | 1989 | 26.861 | 1988 | 27.658 | 1987 | 28.471 | 1986 | 29.297 | 1985 | 30.138 | 1984 | 30.99 | 1983 | 31.858 | 1982 | 32.738 | 1981 | 33.63 | 1980 | 34.532 | 1979 | 35.449 | 1978 | 36.375 | 1977 | 37.311 | 1976 | 38.255 | 1975 | 39.211 |
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