Year | Value | 2023 | 28.653 | 2022 | 29.062 | 2021 | 29.498 | 2020 | 29.985 | 2019 | 30.447 | 2018 | 30.91 | 2017 | 31.35 | 2016 | 32.093 | 2015 | 32.78 | 2014 | 33.322 | 2013 | 33.856 | 2012 | 34.241 | 2011 | 34.512 | 2010 | 34.437 | 2009 | 34.279 | 2008 | 34.099 | 2007 | 34.137 | 2006 | 34.3 | 2005 | 34.445 | 2004 | 34.333 | 2003 | 34.459 | 2002 | 34.744 | 2001 | 35.089 | 2000 | 35.359 | 1999 | 35.731 | 1998 | 36.417 | 1997 | 37.252 | 1996 | 38.124 | 1995 | 38.854 | 1994 | 39.747 | 1993 | 41.008 | 1992 | 42.291 | 1991 | 43.012 | 1990 | 43.716 | 1989 | 44.424 | 1988 | 45.007 | 1987 | 45.609 | 1986 | 46.032 | 1985 | 46.366 | 1984 | 46.639 | 1983 | 46.748 | 1982 | 46.891 | 1981 | 46.901 | 1980 | 46.81 | 1979 | 46.732 | 1978 | 46.561 | 1977 | 46.444 | 1976 | 46.487 | 1975 | 46.477 |
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