Year | Value | 2022 | 67.744 | 2021 | 67.24 | 2020 | 70.15 | 2019 | 70.91 | 2018 | 70.71 | 2017 | 70.467 | 2016 | 70.117 | 2015 | 69.636 | 2014 | 69.074 | 2013 | 68.46 | 2012 | 67.887 | 2011 | 67.359 | 2010 | 66.909 | 2009 | 66.513 | 2008 | 66.149 | 2007 | 65.788 | 2006 | 65.412 | 2005 | 64.996 | 2004 | 64.524 | 2003 | 64.094 | 2002 | 63.616 | 2001 | 63.091 | 2000 | 62.669 | 1999 | 62.207 | 1998 | 61.792 | 1997 | 61.388 | 1996 | 60.984 | 1995 | 60.596 | 1994 | 60.216 | 1993 | 59.815 | 1992 | 59.452 | 1991 | 59.055 | 1990 | 58.652 | 1989 | 58.233 | 1988 | 57.777 | 1987 | 57.315 | 1986 | 56.835 | 1985 | 56.334 | 1984 | 55.816 | 1983 | 55.281 | 1982 | 54.732 | 1981 | 54.175 | 1980 | 53.611 | 1979 | 53.06 | 1978 | 52.492 | 1977 | 51.909 | 1976 | 51.388 | 1975 | 50.812 | 1974 | 50.244 |
|