Year | Value | 2023 | 66.777 | 2022 | 66.481 | 2021 | 65.201 | 2020 | 65.756 | 2019 | 65.662 | 2018 | 65.401 | 2017 | 65.127 | 2016 | 64.792 | 2015 | 64.473 | 2014 | 64.143 | 2013 | 63.839 | 2012 | 63.463 | 2011 | 63.105 | 2010 | 62.747 | 2009 | 62.302 | 2008 | 61.955 | 2007 | 61.475 | 2006 | 61.229 | 2005 | 60.883 | 2004 | 60.557 | 2003 | 60.24 | 2002 | 59.723 | 2001 | 59.587 | 2000 | 58.941 | 1999 | 58.853 | 1998 | 58.301 | 1997 | 58.228 | 1996 | 58.151 | 1995 | 57.83 | 1994 | 57.458 | 1993 | 57.026 | 1992 | 56.576 | 1991 | 56.104 | 1990 | 55.62 | 1989 | 54.983 | 1988 | 54.678 | 1987 | 54.134 | 1986 | 53.756 | 1985 | 53.263 | 1984 | 52.784 | 1983 | 52.121 | 1982 | 51.75 | 1981 | 51.211 | 1980 | 50.681 | 1979 | 50.126 | 1978 | 49.702 | 1977 | 49.17 | 1976 | 48.645 | 1975 | 46.866 |
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