Year | Value | 2023 | 76.373 | 2022 | 76.051 | 2021 | 72.847 | 2020 | 73.428 | 2019 | 74.399 | 2018 | 73.953 | 2017 | 73.51 | 2016 | 73.066 | 2015 | 72.597 | 2014 | 72.095 | 2013 | 71.538 | 2012 | 70.944 | 2011 | 70.323 | 2010 | 69.687 | 2009 | 69.058 | 2008 | 68.451 | 2007 | 67.743 | 2006 | 67.273 | 2005 | 66.668 | 2004 | 66.01 | 2003 | 65.321 | 2002 | 64.548 | 2001 | 63.703 | 2000 | 62.813 | 1999 | 61.893 | 1998 | 60.954 | 1997 | 60.064 | 1996 | 59.194 | 1995 | 58.362 | 1994 | 57.633 | 1993 | 56.959 | 1992 | 56.404 | 1991 | 53.102 | 1990 | 55.574 | 1989 | 55.259 | 1988 | 54.913 | 1987 | 54.608 | 1986 | 54.238 | 1985 | 53.437 | 1984 | 53.263 | 1983 | 52.762 | 1982 | 52.236 | 1981 | 51.782 | 1980 | 51.365 | 1979 | 50.992 | 1978 | 50.594 | 1977 | 50.241 | 1976 | 49.913 | 1975 | 49.581 |
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