| Year | Value | | 2021 | 0.436547 | | 2020 | 0.518117 | | 2019 | 2.1099107355839 | | 2018 | 1.663 | | 2017 | 1.628 | | 2016 | 1.211181 | | 2015 | 1.656 | | 2014 | 1.996584 | | 2013 | 1.935996 | | 2012 | 1.909 | | 2011 | 1.7301367118444 | | 2010 | 0.17675 | | 2009 | 1.614 | | 2008 | 1.86 | | 2007 | 1.966 | | 2006 | 1.855 | | 2005 | 1.784 | | 2004 | 1.732 | | 2003 | 1.48 | | 2002 | 2.108 | | 2001 | 1.899 | | 2000 | 1.826 | | 1999 | 1.8999999762 | | 1998 | 2.5999999046 | | 1997 | 1.2000000477 | | 1996 | 1.2000000477 | | 1995 | 1.2000000477 | | 1994 | 1.3999999762 | | 1993 | 1.1000000238 | | 1992 | 1.1000000238 | | 1991 | 1 | | 1990 | 0.1000000015 | | 1989 | 0.1000000015 | | 1988 | 0.1000000015 | | 1987 | 0.1000000015 | | 1986 | 0.1000000015 | | 1985 | 0.1000000015 |
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