Year | Value | 2021 | 21.12 | 2020 | 21.816 | 2019 | 22.858 | 2018 | 23.929 | 2017 | 24.791 | 2016 | 25.541 | 2015 | 25.834 | 2014 | 26.077 | 2013 | 26.336 | 2012 | 26.91 | 2011 | 27.198 | 2010 | 27.525 | 2009 | 27.934 | 2008 | 28.43 | 2007 | 29.195 | 2006 | 29.658 | 2005 | 30.438 | 2004 | 31.397 | 2003 | 32.249 | 2002 | 33.227 | 2001 | 34.143 | 2000 | 34.505 | 1999 | 34.914 | 1998 | 35.777 | 1997 | 36.228 | 1996 | 36.766 | 1995 | 37.349 | 1994 | 37.794 | 1993 | 38.069 | 1992 | 38.418 | 1991 | 38.65 | 1990 | 39.171 | 1989 | 39.742 | 1988 | 40.036 | 1987 | 40.018 | 1986 | 40.096 | 1985 | 40.423 | 1984 | 41.242 | 1983 | 42.29 | 1982 | 42.717 | 1981 | 43.039 | 1980 | 43.353 | 1979 | 43.358 | 1978 | 43.526 | 1977 | 43.748 | 1976 | 43.928 | 1975 | 44.068 | 1974 | 44.292 | 1973 | 44.416 | 1972 | 44.646 | 1971 | 44.939 | 1970 | 45.174 | 1969 | 45.54 | 1968 | 45.792 | 1967 | 46.065 | 1966 | 46.331 | 1965 | 46.36 | 1964 | 46.633 | 1963 | 46.941 | 1962 | 47.219 | 1961 | 47.764 | 1960 | 48.189 |
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