Year | Value | 2021 | 34.511 | 2020 | 34.953 | 2019 | 35.462 | 2018 | 36.04 | 2017 | 36.601 | 2016 | 37.242 | 2015 | 37.832 | 2014 | 38.584 | 2013 | 39.507 | 2012 | 40.352 | 2011 | 41.162 | 2010 | 41.794 | 2009 | 42.397 | 2008 | 42.981 | 2007 | 43.484 | 2006 | 44.014 | 2005 | 44.242 | 2004 | 44.349 | 2003 | 44.399 | 2002 | 44.746 | 2001 | 45.227 | 2000 | 45.866 | 1999 | 46.155 | 1998 | 46.32 | 1997 | 46.508 | 1996 | 46.802 | 1995 | 47.048 | 1994 | 47.143 | 1993 | 47.084 | 1992 | 47.008 | 1991 | 47.118 | 1990 | 47.11 | 1989 | 47.404 | 1988 | 47.412 | 1987 | 47.588 | 1986 | 47.809 | 1985 | 47.845 | 1984 | 47.712 | 1983 | 47.758 | 1982 | 47.767 | 1981 | 47.677 | 1980 | 47.614 | 1979 | 48.221 | 1978 | 48.583 | 1977 | 48.902 | 1976 | 49.11 | 1975 | 49.349 | 1974 | 49.256 | 1973 | 49.48 | 1972 | 49.616 | 1971 | 49.664 | 1970 | 49.759 | 1969 | 49.719 | 1968 | 49.675 | 1967 | 49.66 | 1966 | 49.747 | 1965 | 49.852 | 1964 | 49.959 | 1963 | 50.037 | 1962 | 50.064 | 1961 | 50.026 | 1960 | 49.929 |
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