| Year | Value | | 2021 | 2.31822 | | 2020 | 4.32123 | | 2019 | 5.1637624 | | 2018 | 4.01487 | | 2017 | 2.83108 | | 2016 | 2.157 | | 2015 | 2.277996 | | 2014 | 3.510996 | | 2013 | 3.759996 | | 2012 | 4.057 | | 2011 | 5.313543 | | 2010 | 5.483 | | 2009 | 18.375 | | 2008 | 13.787 | | 2007 | 13.94 | | 2006 | 13.194 | | 2005 | 1.947 | | 2004 | 0.982 | | 2003 | 0.465 | | 2002 | 0.843 | | 2001 | 0.497 | | 2000 | 1.103 | | 1999 | 0.400000006 | | 1998 | 0.8999999762 | | 1997 | 1.1000000238 | | 1996 | 1.1000000238 | | 1995 | 1 | | 1994 | 2.2000000477 | | 1993 | 1.6000000238 | | 1992 | 0.6000000238 |
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