Year | Value | 2021 | 85.7 | 2020 | 85.4 | 2019 | 85.2 | 2018 | 84.9 | 2017 | 84.7 | 2016 | 84.4 | 2015 | 84.2 | 2014 | 84 | 2013 | 83.9 | 2012 | 83.7 | 2011 | 83.5 | 2010 | 83.3 | 2009 | 83.1 | 2008 | 82.8 | 2007 | 82.6 | 2006 | 82.2 | 2005 | 81.8 | 2004 | 81.5 | 2003 | 81.3 | 2002 | 81.2 | 2001 | 81.1 | 2000 | 81.1 | 1999 | 81.1 | 1998 | 81.1 | 1997 | 81.1 | 1996 | 81 | 1995 | 80.9 | 1994 | 80.7 | 1993 | 80.5 | 1992 | 80.2 | 1991 | 80 | 1990 | 79.7 | 1989 | 79.5 | 1988 | 79.3 | 1987 | 79 | 1986 | 78.8 | 1978 | 78.7 | 1973 | 76.7 |
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