Year | Value | 2021 | 51.645 | 2020 | 52.582 | 2019 | 53.048 | 2018 | 52.285 | 2017 | 51.552 | 2016 | 51.643 | 2015 | 51.167 | 2014 | 48.42 | 2013 | 49.205 | 2012 | 49.396 | 2011 | 48.801 | 2010 | 48.054 | 2009 | 47.545 | 2008 | 47.004 | 2007 | 46.483 | 2006 | 45.927 | 2005 | 45.625 | 2004 | 45.266 | 2003 | 44.963 | 2002 | 44.424 | 2001 | 44.424 | 2000 | 44.318 | 1999 | 44.509 | 1998 | 44.645 | 1997 | 44.786 | 1996 | 45.242 | 1995 | 45.731 | 1994 | 46.209 | 1993 | 46.682 | 1992 | 47.117 | 1991 | 47.57 | 1990 | 47.964 | 1989 | 48.305 | 1988 | 48.558 | 1987 | 48.715 | 1986 | 48.793 | 1985 | 48.816 | 1984 | 48.792 | 1983 | 48.749 | 1982 | 48.656 | 1981 | 48.59 | 1980 | 48.341 | 1979 | 48.107 | 1978 | 47.814 | 1977 | 47.456 | 1976 | 47.052 | 1975 | 46.609 | 1974 | 46.12 | 1973 | 45.597 | 1972 | 45.06 | 1971 | 44.469 | 1970 | 43.863 | 1969 | 43.234 | 1968 | 42.603 | 1967 | 41.964 | 1966 | 41.345 | 1965 | 40.736 | 1964 | 40.146 | 1963 | 39.594 | 1962 | 39.038 | 1961 | 38.515 | 1960 | 38.005 |
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