Year | Value | 2021 | 53.366 | 2020 | 56.026 | 2019 | 56.975 | 2018 | 55.882 | 2017 | 54.47 | 2016 | 53.469 | 2015 | 52.062 | 2014 | 50.315 | 2013 | 49.075 | 2012 | 47.703 | 2011 | 46.242 | 2010 | 44.923 | 2009 | 43.549 | 2008 | 42.602 | 2007 | 42.083 | 2006 | 41.531 | 2005 | 40.825 | 2004 | 41.054 | 2003 | 41.65 | 2002 | 42.298 | 2001 | 43.747 | 2000 | 45.1 | 1999 | 46.188 | 1998 | 47.46 | 1997 | 49.167 | 1996 | 50.959 | 1995 | 53.065 | 1994 | 55.316 | 1993 | 57.475 | 1992 | 59.188 | 1991 | 60.355 | 1990 | 60.919 | 1989 | 61.04 | 1988 | 60.721 | 1987 | 60.191 | 1986 | 59.607 | 1985 | 58.946 | 1984 | 58.161 | 1983 | 56.319 | 1982 | 57.087 | 1981 | 56.514 | 1980 | 55.992 | 1979 | 55.404 | 1978 | 54.669 | 1977 | 53.817 | 1976 | 53.029 | 1975 | 52.252 | 1974 | 51.5 | 1973 | 50.852 | 1972 | 50.091 | 1971 | 49.48 | 1970 | 48.957 | 1969 | 48.483 | 1968 | 48.01 | 1967 | 47.424 | 1966 | 46.861 | 1965 | 46.268 | 1964 | 45.773 | 1963 | 45.287 | 1962 | 44.999 | 1961 | 44.618 | 1960 | 44.254 |
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