Year | Value | 2023 | 77.156 | 2022 | 77.591 | 2021 | 75.722 | 2020 | 76.525 | 2019 | 77.737 | 2018 | 77.454 | 2017 | 77.037 | 2016 | 76.595 | 2015 | 76.539 | 2014 | 76.452 | 2013 | 76.171 | 2012 | 75.552 | 2011 | 74.823 | 2010 | 74.964 | 2009 | 74.679 | 2008 | 74.38 | 2007 | 74.129 | 2006 | 73.804 | 2005 | 73.51 | 2004 | 73.223 | 2003 | 72.906 | 2002 | 72.605 | 2001 | 72.271 | 2000 | 71.931 | 1999 | 70.752 | 1998 | 71.144 | 1997 | 70.668 | 1996 | 70.245 | 1995 | 69.734 | 1994 | 69.402 | 1993 | 69.018 | 1992 | 68.603 | 1991 | 68.287 | 1990 | 67.835 | 1989 | 67.365 | 1988 | 66.902 | 1987 | 66.379 | 1986 | 65.87 | 1985 | 65.344 | 1984 | 64.81 | 1983 | 64.269 | 1982 | 63.74 | 1981 | 63.194 | 1980 | 62.739 | 1979 | 62.161 | 1978 | 61.614 | 1977 | 60.846 | 1976 | 60.014 | 1975 | 59.513 |
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