Year | Value | 2022 | 75.38 | 2021 | 73.04 | 2020 | 72.772 | 2019 | 74.68 | 2018 | 74.417 | 2017 | 73.985 | 2016 | 73.448 | 2015 | 73.498 | 2014 | 73.468 | 2013 | 73.162 | 2012 | 72.517 | 2011 | 71.779 | 2010 | 71.927 | 2009 | 71.57 | 2008 | 71.248 | 2007 | 70.987 | 2006 | 70.624 | 2005 | 70.278 | 2004 | 69.996 | 2003 | 69.624 | 2002 | 69.318 | 2001 | 68.957 | 2000 | 68.582 | 1999 | 67.534 | 1998 | 67.683 | 1997 | 67.141 | 1996 | 66.679 | 1995 | 66.082 | 1994 | 65.822 | 1993 | 65.461 | 1992 | 65.057 | 1991 | 64.797 | 1990 | 64.356 | 1989 | 63.893 | 1988 | 63.467 | 1987 | 63.01 | 1986 | 62.522 | 1985 | 62.008 | 1984 | 61.499 | 1983 | 61.019 | 1982 | 60.53 | 1981 | 59.916 | 1980 | 59.399 | 1979 | 58.771 | 1978 | 58.233 | 1977 | 57.681 | 1976 | 57.003 | 1975 | 56.558 | 1974 | 56.121 |
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