Year | Value | 2021 | 55.4 | 2020 | 58.3 | 2019 | 54.2 | 2018 | 53.9 | 2017 | 53.9 | 2016 | 56.3 | 2015 | 56.2 | 2014 | 57 | 2013 | 60 | 2012 | 65.5 | 2011 | 69 | 2010 | 70.6 | 2009 | 70.5 | 2008 | 70.2 | 2007 | 74.1 | 2006 | 72.7 | 2005 | 71.7 | 2004 | 70 | 2003 | 72 | 2002 | 72.7 | 2001 | 83.5 | 2000 | 81.6 | 1999 | 79.6 | 1998 | 74.1 | 1997 | 73.9 | 1996 | 52 |
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