Year | Value | 2023 | 74.95 | 2022 | 73.56 | 2021 | 69.288 | 2020 | 71.49 | 2019 | 73.907 | 2018 | 73.663 | 2017 | 73.523 | 2016 | 73.33 | 2015 | 73.172 | 2014 | 73.002 | 2013 | 72.805 | 2012 | 72.478 | 2011 | 72.001 | 2010 | 71.617 | 2009 | 71.252 | 2008 | 70.815 | 2007 | 70.297 | 2006 | 69.986 | 2005 | 69.573 | 2004 | 69.054 | 2003 | 68.474 | 2002 | 67.49 | 2001 | 67.072 | 2000 | 66.76 | 1999 | 66.866 | 1998 | 66.887 | 1997 | 66.61 | 1996 | 66.19 | 1995 | 65.781 | 1994 | 65.277 | 1993 | 64.815 | 1992 | 64.388 | 1991 | 64.512 | 1990 | 64.593 | 1989 | 64.711 | 1988 | 64.519 | 1987 | 64.543 | 1986 | 64.869 | 1985 | 62.353 | 1984 | 65.208 | 1983 | 65.108 | 1982 | 64.912 | 1981 | 64.268 | 1980 | 63.855 | 1979 | 63.402 | 1978 | 63.193 | 1977 | 62.723 | 1976 | 62.219 | 1975 | 61.677 |
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