Year | Value | 2022 | 27.448 | 2021 | 27.755 | 2020 | 28.058 | 2019 | 28.356 | 2018 | 28.649 | 2017 | 28.938 | 2016 | 29.221 | 2015 | 29.5 | 2014 | 29.773 | 2013 | 30.047 | 2012 | 30.322 | 2011 | 30.642 | 2010 | 31.089 | 2009 | 31.54 | 2008 | 32.057 | 2007 | 32.579 | 2006 | 33.105 | 2005 | 33.635 | 2004 | 34.104 | 2003 | 34.511 | 2002 | 34.919 | 2001 | 35.33 | 2000 | 35.425 | 1999 | 35.298 | 1998 | 35.171 | 1997 | 35.044 | 1996 | 34.917 | 1995 | 34.791 | 1994 | 34.665 | 1993 | 34.539 | 1992 | 34.413 | 1991 | 34.287 | 1990 | 34.162 | 1989 | 34.19 | 1988 | 34.368 | 1987 | 34.547 | 1986 | 34.726 | 1985 | 34.905 | 1984 | 35.085 | 1983 | 35.266 | 1982 | 35.447 | 1981 | 35.628 | 1980 | 35.809 | 1979 | 36.107 | 1978 | 36.52 | 1977 | 36.934 | 1976 | 37.35 | 1975 | 37.769 | 1974 | 38.19 | 1973 | 38.612 | 1972 | 39.035 | 1971 | 39.461 | 1970 | 39.888 | 1969 | 40.309 | 1968 | 40.724 | 1967 | 41.141 | 1966 | 41.559 | 1965 | 41.978 | 1964 | 42.397 | 1963 | 42.819 | 1962 | 43.242 | 1961 | 43.665 | 1960 | 44.089 |
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