Year | Value | 2023 | 71.561 | 2022 | 71.462 | 2021 | 68.184 | 2020 | 66.846 | 2019 | 70.217 | 2018 | 69.92 | 2017 | 69.564 | 2016 | 69.546 | 2015 | 69.126 | 2014 | 68.818 | 2013 | 68.243 | 2012 | 68.064 | 2011 | 67.425 | 2010 | 67.324 | 2009 | 66.949 | 2008 | 66.226 | 2007 | 65.378 | 2006 | 65.23 | 2005 | 64.566 | 2004 | 64.447 | 2003 | 63.982 | 2002 | 63.762 | 2001 | 63.024 | 2000 | 62.035 | 1999 | 61.449 | 1998 | 60.053 | 1997 | 59.157 | 1996 | 58.776 | 1995 | 58.052 | 1994 | 54.886 | 1993 | 57.078 | 1992 | 56.139 | 1991 | 58.92 | 1990 | 59.182 | 1989 | 59.694 | 1988 | 59.535 | 1987 | 59.808 | 1986 | 59.713 | 1985 | 59.564 | 1984 | 58.838 | 1983 | 59.425 | 1982 | 59.13 | 1981 | 58.701 | 1980 | 58.018 | 1979 | 57.341 | 1978 | 56.713 | 1977 | 56.029 | 1976 | 55.435 | 1975 | 54.422 |
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