Year | Value | 2022 | 41.536 | 2021 | 41.102 | 2020 | 40.669 | 2019 | 40.238 | 2018 | 39.808 | 2017 | 39.38 | 2016 | 38.954 | 2015 | 38.529 | 2014 | 38.106 | 2013 | 37.685 | 2012 | 37.267 | 2011 | 36.849 | 2010 | 36.434 | 2009 | 36.021 | 2008 | 35.61 | 2007 | 35.2 | 2006 | 34.794 | 2005 | 33.75 | 2004 | 32.49 | 2003 | 31.252 | 2002 | 30.042 | 2001 | 28.859 | 2000 | 27.706 | 1999 | 27.134 | 1998 | 26.755 | 1997 | 26.379 | 1996 | 26.008 | 1995 | 25.638 | 1994 | 25.586 | 1993 | 25.649 | 1992 | 25.713 | 1991 | 25.776 | 1990 | 25.84 | 1989 | 25.806 | 1988 | 25.727 | 1987 | 25.648 | 1986 | 25.57 | 1985 | 25.491 | 1984 | 24.954 | 1983 | 24.257 | 1982 | 23.574 | 1981 | 22.905 | 1980 | 22.25 | 1979 | 21.607 | 1978 | 20.978 | 1977 | 19.958 | 1976 | 18.596 | 1975 | 17.304 | 1974 | 16.085 | 1973 | 14.936 | 1972 | 13.858 | 1971 | 12.842 | 1970 | 11.893 | 1969 | 11.698 | 1968 | 11.516 | 1967 | 11.336 | 1966 | 11.393 | 1965 | 11.458 | 1964 | 11.404 | 1963 | 11.345 | 1962 | 11.288 | 1961 | 11.23 | 1960 | 11.173 |
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