Year | Value | 2022 | 73.488 | 2021 | 69.366 | 2020 | 66.868 | 2019 | 73.102 | 2018 | 72.76 | 2017 | 72.248 | 2016 | 72.004 | 2015 | 71.451 | 2014 | 71.116 | 2013 | 70.881 | 2012 | 70.36 | 2011 | 69.984 | 2010 | 69.529 | 2009 | 69.356 | 2008 | 68.811 | 2007 | 68.603 | 2006 | 68.165 | 2005 | 67.562 | 2004 | 67.346 | 2003 | 66.756 | 2002 | 66.239 | 2001 | 65.51 | 2000 | 64.891 | 1999 | 64.189 | 1998 | 63.561 | 1997 | 62.973 | 1996 | 62.622 | 1995 | 62.305 | 1994 | 61.594 | 1993 | 61.286 | 1992 | 61.296 | 1991 | 62.052 | 1990 | 62.352 | 1989 | 62.582 | 1988 | 62.729 | 1987 | 62.569 | 1986 | 62.194 | 1985 | 62.093 | 1984 | 61.956 | 1983 | 61.96 | 1982 | 61.447 | 1981 | 61.291 | 1980 | 61.081 | 1979 | 60.867 | 1978 | 60.713 | 1977 | 60.627 | 1976 | 60.521 | 1975 | 60.337 | 1974 | 60.228 |
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