Year | Value | 2021 | 0.51575225627293 | 2020 | 0.5092730338193 | 2019 | 0.50272736288803 | 2018 | 0.49628086878905 | 2017 | 0.49256857855362 | 2016 | 0.48538653366584 | 2015 | 0.48039900249377 | 2014 | 0.47343640897756 | 2013 | 0.46647381546135 | 2012 | 0.45951122194514 | 2011 | 0.45254862842893 | 2010 | 0.44558603491272 | 2009 | 0.43078304239401 | 2008 | 0.41598004987531 | 2007 | 0.40117705735661 | 2006 | 0.3863740648379 | 2005 | 0.3715710723192 | 2004 | 0.3567680798005 | 2003 | 0.34196508728179 | 2002 | 0.32716209476309 | 2001 | 0.31235910224439 | 2000 | 0.29755610972569 | 1999 | 0.28482793017456 | 1998 | 0.27209975062344 | 1997 | 0.25937157107232 | 1996 | 0.2466433915212 | 1995 | 0.23391521197008 | 1994 | 0.22118703241895 | 1993 | 0.20845885286783 | 1992 | 0.19573067331671 | 1991 | 0.18300249376559 | 1990 | 0.17027431421446 |
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