Year | Value | 2021 | 2.768 | 2020 | 2.736 | 2019 | 2.709 | 2018 | 2.74 | 2017 | 2.623 | 2016 | 2.552 | 2015 | 2.35 | 2014 | 2.16 | 2013 | 2.127 | 2012 | 2.016 | 2011 | 1.993 | 2010 | 2.022 | 2009 | 2.075 | 2008 | 2.078 | 2007 | 1.951 | 2006 | 1.946 | 2005 | 1.901 | 2004 | 1.883 | 2003 | 1.801 | 2002 | 1.843 | 2001 | 1.853 | 2000 | 1.825 | 1999 | 1.802 |
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