| Year | Value | | 2022 | 0.50936438935775 | | 2021 | 0.81928168364649 | | 2020 | 0.90718867619272 | | 2019 | 1.0209163668913 | | 2018 | 0.8356257584576 | | 2017 | 0.83189496800779 | | 2016 | 0.93355176528571 | | 2014 | 1.0416921334727 | | 2013 | 1.0780846039463 | | 2012 | 1.0469063707171 | | 2011 | 0.93651358475802 | | 2010 | 1.0144155648477 | | 2009 | 1.103033241459 | | 2008 | 1.1546685060829 | | 2007 | 1.2968768215273 | | 2006 | 0.97899879573514 | | 2005 | 1.0363212394277 | | 2004 | 0.98823974095448 | | 2003 | 1.0299274586314 | | 2002 | 0.9983377015242 | | 2001 | 0.99981747947367 | | 2000 | 0.78464508041381 | | 1999 | 0.81960705940903 | | 1998 | 1.1497382832592 | | 1997 | 1.1129390064558 | | 1996 | 1.2019944598338 | | 1995 | 1.0324216627423 | | 1994 | 0.83873174930749 | | 1993 | 1.0626202089111 |
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