| Year | Value | | 2021 | 10,546 | | 2020 | 10,378 | | 2019 | 10,378 | | 2018 | 10,315 | | 2017 | 10,207 | | 2016 | 10,131 | | 2015 | 10,131 | | 2014 | 10,087 | | 2013 | 9,718 | | 2012 | 9,642 | | 2011 | 9,642 | | 2010 | 9,594 | | 2009 | 9,080 | | 2008 | 8,699 | | 2007 | 8,697 | | 2006 | 8,697 | | 2005 | 8,697 | | 2004 | 8,697 | | 2003 | 8,697 | | 2002 | 8,671 | | 2001 | 8,671 | | 2000 | 8,671 | | 1999 | 8,682 | | 1998 | 8,607 | | 1997 | 8,607 | | 1996 | 8,607 | | 1995 | 8,549 |
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