| Year | Value | | 2021 | 0.00233029 | | 2020 | 0.005855 | | 2019 | 0.495853 | | 2018 | 1.263266 | | 2017 | 0.02165 | | 2016 | 0.088343 | | 2015 | 0.06929 | | 2014 | 0.237168 | | 2013 | 0.59035 | | 2012 | 0.78235 | | 2011 | 1.486294 | | 2010 | 1.3027 | | 2009 | 2.182 | | 2008 | 2.07 | | 2007 | 1.23 | | 2006 | 1.23 | | 2005 | 2.025 | | 2004 | 2.116 | | 2003 | 4.849 | | 2002 | 6.113 | | 2001 | 5.569 | | 2000 | 3.714 | | 1999 | 6.1999998093 | | 1998 | 5.1999998093 | | 1997 | 3.2000000477 | | 1996 | 1.6000000238 | | 1995 | 1.1000000238 | | 1994 | 0.6999999881 | | 1993 | 0.6999999881 |
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