| Year | Value | | 2021 | 474,000 | | 2020 | 474,000 | | 2019 | 478,116 | | 2018 | 482,029 | | 2017 | 465,331 | | 2016 | 416,572 | | 2015 | 424,712 | | 2014 | 376,696 | | 2013 | 323,105 | | 2012 | 302,147 | | 2011 | 274,872 | | 2010 | 115,500 | | 2009 | 50,000 | | 2008 | 30,000 | | 2007 | 10,900 | | 2006 | 7,000 | | 2005 | 6,000 | | 2004 | 3,000 | | 2003 | 1,060 | | 2002 | 999 | | 2001 | 967 | | 2000 | 1,151 | | 1999 | 1,093 | | 1998 | 702 | | 1997 | 658 | | 1996 | 337 | | 1995 | 230 | | 1994 | 144 |
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