Year | Value | 2020 | 2.0582672017381 | 2019 | 2.0227699762719 | 2018 | 2.0609447696148 | 2017 | 2.1031350048526 | 2016 | 2.0837137509679 | 2015 | 2.0734089686157 | 2014 | 2.0781200673182 | 2013 | 2.0992700211259 | 2012 | 2.1288357909781 | 2011 | 2.1311304138234 | 2010 | 2.1475129999673 | 2009 | 2.1634594861405 | 2008 | 2.1831718451769 | 2007 | 2.2245717880168 | 2006 | 2.2690815228415 | 2005 | 2.3637587380203 | 2004 | 2.4048506414602 | 2003 | 2.4184020067533 | 2002 | 2.468570823778 | 2001 | 2.4968348945895 | 2000 | 2.4825386181849 | 1999 | 2.5216525617789 | 1998 | 2.5905623303103 | 1997 | 2.6484016234935 | 1996 | 2.7073770518132 | 1995 | 2.7736656157491 | 1994 | 2.360346184107 | 1993 | 2.4042317437745 | 1992 | 2.4765669143615 | 1991 | 2.5551834451368 |
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