Year | Value | 2021 | 35.541 | 2020 | 36.085 | 2019 | 36.689 | 2018 | 37.294 | 2017 | 37.898 | 2016 | 38.977 | 2015 | 40.088 | 2014 | 40.965 | 2013 | 41.71 | 2012 | 42.336 | 2011 | 42.805 | 2010 | 43.206 | 2009 | 43.524 | 2008 | 43.883 | 2007 | 44.152 | 2006 | 44.372 | 2005 | 44.219 | 2004 | 44.235 | 2003 | 44.461 | 2002 | 44.463 | 2001 | 44.812 | 2000 | 45.188 | 1999 | 45.339 | 1998 | 45.529 | 1997 | 45.762 | 1996 | 46.002 | 1995 | 46.036 | 1994 | 46.076 | 1993 | 46.173 | 1992 | 46.428 | 1991 | 46.659 | 1990 | 46.842 | 1989 | 47.068 | 1988 | 47.47 | 1987 | 48.025 | 1986 | 48.466 | 1985 | 48.857 | 1984 | 48.814 | 1983 | 48.741 | 1982 | 48.872 | 1981 | 49.058 | 1980 | 49.138 | 1979 | 49.186 | 1978 | 48.989 | 1977 | 48.52 | 1976 | 48.083 | 1975 | 47.92 | 1974 | 47.741 | 1973 | 47.578 | 1972 | 47.453 | 1971 | 47.464 | 1970 | 47.554 | 1969 | 47.632 | 1968 | 47.768 | 1967 | 47.597 | 1966 | 47.457 | 1965 | 47.33 | 1964 | 47.154 | 1963 | 46.865 | 1962 | 46.693 | 1961 | 46.504 | 1960 | 46.272 |
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