Year | Value | 2022 | 70.55 | 2021 | 65.646 | 2020 | 62.986 | 2019 | 70.23 | 2018 | 69.693 | 2017 | 68.953 | 2016 | 68.411 | 2015 | 68.081 | 2014 | 67.813 | 2013 | 67.482 | 2012 | 66.905 | 2011 | 66.64 | 2010 | 66.255 | 2009 | 65.976 | 2008 | 65.623 | 2007 | 65.189 | 2006 | 64.762 | 2005 | 64.154 | 2004 | 63.881 | 2003 | 63.161 | 2002 | 62.589 | 2001 | 61.697 | 2000 | 61.032 | 1999 | 60.276 | 1998 | 59.539 | 1997 | 58.849 | 1996 | 58.594 | 1995 | 58.009 | 1994 | 57.044 | 1993 | 56.611 | 1992 | 56.583 | 1991 | 57.919 | 1990 | 58.423 | 1989 | 58.896 | 1988 | 58.903 | 1987 | 58.778 | 1986 | 58.608 | 1985 | 58.523 | 1984 | 58.276 | 1983 | 58.037 | 1982 | 57.456 | 1981 | 57.266 | 1980 | 57.006 | 1979 | 56.695 | 1978 | 56.45 | 1977 | 56.347 | 1976 | 56.064 | 1975 | 56.011 | 1974 | 55.727 |
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