Year | Value | 2023 | 67.982 | 2022 | 67.545 | 2021 | 67.102 | 2020 | 66.652 | 2019 | 66.195 | 2018 | 65.732 | 2017 | 65.261 | 2016 | 64.784 | 2015 | 64.3 | 2014 | 63.81 | 2013 | 63.317 | 2012 | 62.821 | 2011 | 62.322 | 2010 | 61.821 | 2009 | 61.016 | 2008 | 60.194 | 2007 | 59.363 | 2006 | 58.529 | 2005 | 57.689 | 2004 | 56.846 | 2003 | 55.997 | 2002 | 55.146 | 2001 | 54.291 | 2000 | 53.435 | 1999 | 52.505 | 1998 | 51.572 | 1997 | 50.637 | 1996 | 49.704 | 1995 | 48.768 | 1994 | 47.834 | 1993 | 46.902 | 1992 | 45.973 | 1991 | 45.044 | 1990 | 44.12 | 1989 | 41.504 | 1988 | 38.902 | 1987 | 36.355 | 1986 | 33.885 | 1985 | 31.5 | 1984 | 29.792 | 1983 | 28.133 | 1982 | 26.535 | 1981 | 24.995 | 1980 | 23.518 | 1979 | 23.02 | 1978 | 22.612 | 1977 | 22.209 | 1976 | 21.812 | 1975 | 21.419 |
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