Year | Value | 2021 | 5.375 | 2019 | 3.066 | 2018 | 2.908 | 2017 | 2.751 | 2016 | 1.906 | 2015 | 2.566 | 2014 | 2.447 | 2013 | 2.36 | 2012 | 2.253 | 2011 | 2.209 | 2010 | 2.124 | 2009 | 2.082 | 2008 | 2.03 | 2007 | 1.996 | 2006 | 1.82 | 2005 | 1.879 | 2004 | 1.897 | 2003 | 1.849 | 2002 | 1.868 | 2001 | 1.906 | 2000 | 1.898 | 1998 | 1.882 | 1997 | 1.877 | 1996 | 1.869 | 1995 | 1.863 | 1994 | 1.81 | 1993 | 1.745 | 1992 | 1.688 | 1991 | 1.583 | 1990 | 1.519 |
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