| Year | Value | | 2021 | 1,137.726 | | 2020 | 2,530 | | 2019 | 4,283 | | 2018 | 4,021 | | 2017 | 4,135 | | 2016 | 6,472 | | 2015 | 6,884 | | 2014 | 7,985 | | 2013 | 6,263 | | 2012 | 6,529.8968762677 | | 2011 | 7,320 | | 2010 | 5,709.6689157383 | | 2009 | 9,758 | | 2008 | 8,191 | | 2007 | 7,891 | | 2006 | 2,976 | | 2005 | 6,987 | | 2004 | 8,494 | | 2003 | 7,210 | | 2002 | 5,936 | | 2001 | 4,511 | | 2000 | 3,953 | | 1999 | 3,800 | | 1998 | 2,600 | | 1997 | 2,600 | | 1996 | 2,600 | | 1995 | 3,500 | | 1994 | 3,200 |
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