Year | Value | 2023 | 78.085 | 2022 | 77.629 | 2021 | 73.201 | 2020 | 77.407 | 2019 | 77.413 | 2018 | 77.426 | 2017 | 77.3 | 2016 | 77.571 | 2015 | 77.745 | 2014 | 77.825 | 2013 | 78.028 | 2012 | 78.162 | 2011 | 78.051 | 2010 | 77.876 | 2009 | 77.584 | 2008 | 77.589 | 2007 | 77.55 | 2006 | 77.406 | 2005 | 77.54 | 2004 | 77.326 | 2003 | 77.405 | 2002 | 76.766 | 2001 | 76.429 | 2000 | 75.922 | 1999 | 75.719 | 1998 | 75.412 | 1997 | 75.064 | 1996 | 74.69 | 1995 | 74.346 | 1994 | 74.092 | 1993 | 73.874 | 1992 | 73.846 | 1991 | 73.757 | 1990 | 73.823 | 1989 | 73.69 | 1988 | 73.724 | 1987 | 73.596 | 1986 | 73.558 | 1985 | 73.464 | 1984 | 73.552 | 1983 | 73.564 | 1982 | 73.439 | 1981 | 72.996 | 1980 | 72.603 | 1979 | 72.272 | 1978 | 71.89 | 1977 | 71.411 | 1976 | 70.878 | 1975 | 70.375 |
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