Year | Value | 2023 | 68.932 | 2022 | 68.617 | 2021 | 67.314 | 2020 | 68 | 2019 | 67.683 | 2018 | 67.392 | 2017 | 67.053 | 2016 | 66.706 | 2015 | 66.349 | 2014 | 65.981 | 2013 | 65.609 | 2012 | 65.207 | 2011 | 64.797 | 2010 | 64.437 | 2009 | 63.994 | 2008 | 63.653 | 2007 | 63.164 | 2006 | 62.913 | 2005 | 62.566 | 2004 | 62.247 | 2003 | 61.929 | 2002 | 61.392 | 2001 | 61.261 | 2000 | 60.605 | 1999 | 60.543 | 1998 | 60.019 | 1997 | 60.134 | 1996 | 59.693 | 1995 | 59.266 | 1994 | 58.769 | 1993 | 58.176 | 1992 | 57.607 | 1991 | 57.058 | 1990 | 56.545 | 1989 | 56.046 | 1988 | 55.653 | 1987 | 55.188 | 1986 | 54.906 | 1985 | 54.466 | 1984 | 54.023 | 1983 | 53.373 | 1982 | 53.07 | 1981 | 52.571 | 1980 | 52.069 | 1979 | 51.512 | 1978 | 51.029 | 1977 | 50.532 | 1976 | 50.056 | 1975 | 48.257 |
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