Year | Value | 2021 | 19.985695213606 | 2020 | 18.753451890615 | 2019 | 16.056665742265 | 2018 | 14.155259557449 | 2017 | 12.537133977529 | 2016 | 10.857785612819 | 2015 | 9.0700282688762 | 2014 | 7.1208997120244 | 2013 | 5.5040912204534 | 2012 | 4.7473735726082 | 2011 | 3.9070959108599 | 2010 | 3.4296773533493 | 2009 | 2.7780051535333 | 2008 | 2.1197559700851 | 2007 | 2.1427425515674 | 2006 | 1.1343767443711 | 2005 | 0.86308351407031 | 2004 | 0.57984396029201 | 2003 | 0.41932951812813 | 2002 | 0.28982776861215 | 2001 | 0.12097059467219 | 2000 | 0.078776212567484 | 1999 | 0.052656654858447 | 1998 | 0.023908531164735 | 1997 | 0.010174497207701 | 1996 | 0.001820995124996 | 1995 | 0.00021860022188693 |
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