Year | Value | 2021 | 27.519 | 2020 | 27.967 | 2019 | 28.276 | 2018 | 28.594 | 2017 | 28.963 | 2016 | 29.306 | 2015 | 29.699 | 2014 | 30.462 | 2013 | 31.181 | 2012 | 31.601 | 2011 | 31.872 | 2010 | 32.109 | 2009 | 32.193 | 2008 | 32.361 | 2007 | 32.589 | 2006 | 32.402 | 2005 | 32.867 | 2004 | 33.513 | 2003 | 34.132 | 2002 | 34.868 | 2001 | 35.342 | 2000 | 35.761 | 1999 | 36.475 | 1998 | 37.079 | 1997 | 37.683 | 1996 | 38.516 | 1995 | 39.211 | 1994 | 40.097 | 1993 | 40.756 | 1992 | 41.829 | 1991 | 42.531 | 1990 | 43.147 | 1989 | 43.684 | 1988 | 44.011 | 1987 | 44.207 | 1986 | 44.29 | 1985 | 44.245 | 1984 | 44.469 | 1983 | 44.669 | 1982 | 44.567 | 1981 | 44.156 | 1980 | 43.539 | 1979 | 43.235 | 1978 | 43.117 | 1977 | 43.027 | 1976 | 42.941 | 1975 | 43.017 | 1974 | 43.115 | 1973 | 43.281 | 1972 | 43.342 | 1971 | 43.445 | 1970 | 43.549 | 1969 | 43.724 | 1968 | 44.201 | 1967 | 44.579 | 1966 | 44.831 | 1965 | 45.091 | 1964 | 45.298 | 1963 | 45.503 | 1962 | 45.647 | 1961 | 45.76 | 1960 | 45.749 |
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