Year | Value | 2023 | 72.161 | 2022 | 71.025 | 2021 | 73.303 | 2020 | 72.971 | 2019 | 72.849 | 2018 | 72.95 | 2017 | 72.792 | 2016 | 72.628 | 2015 | 72.464 | 2014 | 72.254 | 2013 | 72.003 | 2012 | 71.698 | 2011 | 71.534 | 2010 | 71.434 | 2009 | 71.273 | 2008 | 70.859 | 2007 | 70.387 | 2006 | 69.87 | 2005 | 69.343 | 2004 | 68.524 | 2003 | 68.412 | 2002 | 68.02 | 2001 | 67.652 | 2000 | 67.368 | 1999 | 67.187 | 1998 | 66.94 | 1997 | 66.473 | 1996 | 65.918 | 1995 | 65.876 | 1994 | 65.96 | 1993 | 66.069 | 1992 | 65.885 | 1991 | 65.74 | 1990 | 65.629 | 1989 | 65.349 | 1988 | 65.051 | 1987 | 64.762 | 1986 | 64.263 | 1985 | 63.477 | 1984 | 62.402 | 1983 | 61.25 | 1982 | 60.244 | 1981 | 59.425 | 1980 | 58.756 | 1979 | 58.383 | 1978 | 58.096 | 1977 | 57.875 | 1976 | 57.447 | 1975 | 56.904 |
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