Year | Value | 2022 | 54.592 | 2021 | 55.721 | 2020 | 59.058 | 2019 | 59.426 | 2018 | 58.931 | 2017 | 58.651 | 2016 | 58.113 | 2015 | 57.312 | 2014 | 56.544 | 2013 | 55.356 | 2012 | 54.433 | 2011 | 53.601 | 2010 | 53.275 | 2009 | 52.608 | 2008 | 51.885 | 2007 | 51.133 | 2006 | 50.382 | 2005 | 49.813 | 2004 | 49.285 | 2003 | 49.319 | 2002 | 49.37 | 2001 | 49.377 | 2000 | 49.908 | 1999 | 50.795 | 1998 | 51.864 | 1997 | 53.126 | 1996 | 54.5 | 1995 | 56.034 | 1994 | 57.203 | 1993 | 58.162 | 1992 | 58.734 | 1991 | 59.115 | 1990 | 59.393 | 1989 | 59.425 | 1988 | 55.741 | 1987 | 55.631 | 1986 | 54.868 | 1985 | 54.281 | 1984 | 53.682 | 1983 | 53.021 | 1982 | 52.564 | 1981 | 52.083 | 1980 | 51.834 | 1979 | 55.237 | 1978 | 55.041 | 1977 | 54.693 | 1976 | 54.333 | 1975 | 53.952 | 1974 | 53.516 |
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