Year | Value | 2022 | 79.246 | 2021 | 78.76 | 2020 | 79.174 | 2019 | 80.019 | 2018 | 79.857 | 2017 | 79.689 | 2016 | 79.557 | 2015 | 79.405 | 2014 | 79.328 | 2013 | 79.246 | 2012 | 79.081 | 2011 | 78.89 | 2010 | 78.748 | 2009 | 78.461 | 2008 | 78.084 | 2007 | 77.634 | 2006 | 77.156 | 2005 | 76.931 | 2004 | 76.56 | 2003 | 76.337 | 2002 | 76.088 | 2001 | 75.908 | 2000 | 75.496 | 1999 | 74.98 | 1998 | 74.641 | 1997 | 74.535 | 1996 | 74.355 | 1995 | 73.799 | 1994 | 73.517 | 1993 | 73.375 | 1992 | 72.953 | 1991 | 72.764 | 1990 | 72.668 | 1989 | 72.619 | 1988 | 72.444 | 1987 | 72.369 | 1986 | 72.269 | 1985 | 72.106 | 1984 | 72.012 | 1983 | 71.668 | 1982 | 71.47 | 1981 | 71.183 | 1980 | 70.826 | 1979 | 70.456 | 1978 | 69.978 | 1977 | 69.604 | 1976 | 69.118 | 1975 | 68.466 | 1974 | 67.864 |
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