Year | Value | 2023 | 77.392 | 2022 | 76.577 | 2021 | 72.746 | 2020 | 72.004 | 2019 | 77.286 | 2018 | 77.248 | 2017 | 76.22 | 2016 | 76.094 | 2015 | 76.222 | 2014 | 76.141 | 2013 | 75.832 | 2012 | 75.486 | 2011 | 75.179 | 2010 | 75.188 | 2009 | 74.901 | 2008 | 74.709 | 2007 | 74.226 | 2006 | 74.01 | 2005 | 73.909 | 2004 | 73.868 | 2003 | 73.632 | 2002 | 73.164 | 2001 | 72.571 | 2000 | 72.09 | 1999 | 71.92 | 1998 | 71.949 | 1997 | 72.007 | 1996 | 71.82 | 1995 | 71.349 | 1994 | 70.876 | 1993 | 70.07 | 1992 | 69.468 | 1991 | 69.04 | 1990 | 68.445 | 1989 | 67.817 | 1988 | 67.038 | 1987 | 66.587 | 1986 | 66.123 | 1985 | 65.625 | 1984 | 65.202 | 1983 | 64.659 | 1982 | 64.271 | 1981 | 63.809 | 1980 | 63.326 | 1979 | 62.854 | 1978 | 62.397 | 1977 | 61.935 | 1976 | 61.425 | 1975 | 61.085 |
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