Year | Value | 2023 | 78.983 | 2022 | 78.094 | 2021 | 76.401 | 2020 | 77.599 | 2019 | 79.023 | 2018 | 78.977 | 2017 | 78.781 | 2016 | 78.539 | 2015 | 78.472 | 2014 | 78.273 | 2013 | 78.062 | 2012 | 77.816 | 2011 | 77.532 | 2010 | 77.257 | 2009 | 76.93 | 2008 | 76.585 | 2007 | 76.191 | 2006 | 75.744 | 2005 | 75.292 | 2004 | 74.824 | 2003 | 74.337 | 2002 | 73.843 | 2001 | 73.4 | 2000 | 72.96 | 1999 | 72.546 | 1998 | 72.152 | 1997 | 71.779 | 1996 | 71.367 | 1995 | 70.947 | 1994 | 70.527 | 1993 | 70.108 | 1992 | 69.667 | 1991 | 69.187 | 1990 | 68.706 | 1989 | 68.221 | 1988 | 67.734 | 1987 | 67.286 | 1986 | 66.869 | 1985 | 66.441 | 1984 | 65.997 | 1983 | 65.572 | 1982 | 65.121 | 1981 | 64.656 | 1980 | 64.195 | 1979 | 63.73 | 1978 | 63.275 | 1977 | 62.83 | 1976 | 62.405 | 1975 | 61.987 |
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