Year | Value | 2023 | 65.987 | 2022 | 65.54 | 2021 | 63.83 | 2020 | 64.2 | 2019 | 64.381 | 2018 | 64.105 | 2017 | 63.71 | 2016 | 63.335 | 2015 | 62.833 | 2014 | 62.427 | 2013 | 62.116 | 2012 | 61.719 | 2011 | 61.337 | 2010 | 60.743 | 2009 | 60.351 | 2008 | 59.815 | 2007 | 59.362 | 2006 | 58.962 | 2005 | 58.548 | 2004 | 58.103 | 2003 | 58.041 | 2002 | 57.824 | 2001 | 57.506 | 2000 | 56.734 | 1999 | 56.564 | 1998 | 56.426 | 1997 | 56.207 | 1996 | 56.33 | 1995 | 56.234 | 1994 | 55.592 | 1993 | 55.734 | 1992 | 54.375 | 1991 | 55.194 | 1990 | 55.469 | 1989 | 55.369 | 1988 | 55.133 | 1987 | 54.832 | 1986 | 54.494 | 1985 | 54.075 | 1984 | 53.745 | 1983 | 53.334 | 1982 | 52.893 | 1981 | 52.355 | 1980 | 52.046 | 1979 | 51.597 | 1978 | 51.172 | 1977 | 50.755 | 1976 | 50.335 | 1975 | 49.923 |
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