Year | Value | 2020 | 0.39629689926689 | 2019 | 0.45490650439053 | 2018 | 0.44229413785262 | 2017 | 0.44165854023177 | 2016 | 0.45521812080337 | 2015 | 0.49983293106394 | 2014 | 0.50689554587358 | 2013 | 0.52054907295138 | 2012 | 0.53866756274592 | 2011 | 0.55143231194578 | 2010 | 0.51212843886322 | 2009 | 0.47968161370817 | 2008 | 0.48670236162768 | 2007 | 0.49765425319441 | 2005 | 0.52731619236894 | 2004 | 0.53404283999937 | 2003 | 0.57509038603892 | 2002 | 0.6169568599718 | 2001 | 0.6483272674882 | 2000 | 0.69608541211376 | 1999 | 0.68952997505304 | 1998 | 0.68263884599574 | 1997 | 0.69394688508029 | 1996 | 0.72801676165633 | 1995 | 0.7658358817045 | 1994 | 0.49822957264616 | 1993 | 0.54035486284815 | 1992 | 0.5356405715456 | 1991 | 0.58375714457979 |
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