Year | Value | 2021 | 82.5 | 2020 | 80 | 2019 | 82.6 | 2018 | 80.7 | 2017 | 81.6 | 2016 | 80.6 | 2015 | 80.9 | 2014 | 81 | 2013 | 80.7 | 2012 | 79.7 | 2011 | 79.5 | 2010 | 79.5 | 2009 | 79.5 | 2008 | 80 | 2007 | 79.1 | 2006 | 78.9 | 2005 | 77.4 | 2004 | 78.6 | 2003 | 78.4 | 2002 | 77.1 | 2001 | 76.3 | 2000 | 73.9 | 1999 | 75.5 | 1998 | 73.6 | 1997 | 71.9 | 1996 | 72.3 | 1995 | 75 | 1994 | 75.3 |
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