| Year | Value | | 2021 | 10.989998888765 | | 2020 | 10.946845945846 | | 2019 | 10.882060969737 | | 2018 | 11.019002111346 | | 2017 | 10.98529466237 | | 2016 | 10.979812571767 | | 2015 | 10.964588657999 | | 2014 | 10.916101789088 | | 2013 | 10.888135718784 | | 2012 | 10.865096121791 | | 2011 | 10.808830610809 | | 2010 | 10.624810164092 | | 2009 | 10.600511167908 | | 2008 | 10.56406267363 | | 2007 | 10.609030633033 | | 2006 | 10.599696262548 | | 2005 | 10.579805163537 | | 2004 | 10.548875801015 | | 2003 | 10.498796162537 | | 2002 | 10.499648109049 | | 2001 | 10.875171315331 | | 2000 | 11.171352372486 | | 1999 | 11.874023039597 | | 1998 | 11.910508575027 | | 1997 | 12.057561951328 | | 1996 | 12.226395525429 | | 1995 | 12.859391784272 | | 1994 | 12.846982998111 | | 1993 | 12.979219913324 | | 1992 | 12.984776086232 |
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