| Year | Value | | 2021 | 0.60711 | | 2020 | 0.45188 | | 2019 | 1.22908832 | | 2018 | 0.6445 | | 2017 | 0.55191 | | 2016 | 0.48691018177291 | | 2015 | 0.48963 | | 2014 | 0.628572 | | 2013 | 0.831444 | | 2012 | 1.07716 | | 2011 | 1.18356 | | 2010 | 1.00226 | | 2009 | 0.686 | | 2008 | 0.813 | | 2007 | 0.895 | | 2006 | 0.78 | | 2005 | 0.62 | | 2004 | 0.595 | | 2003 | 0.54 | | 2002 | 0.253 | | 2001 | 0.225 | | 2000 | 0.617 | | 1999 | 0.8000000119 | | 1998 | 0.400000006 | | 1997 | 0.6999999881 | | 1996 | 0.8000000119 | | 1995 | 0.6999999881 | | 1994 | 1.7999999523 | | 1993 | 1.7999999523 | | 1992 | 10.6000003815 |
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