| Year | Value | | 2022 | 36,708 | | 2021 | 34,149 | | 2020 | 35,438 | | 2019 | 40,537 | | 2018 | 41,045 | | 2017 | 41,035 | | 2016 | 41,136 | | 2015 | 41,441 | | 2014 | 38,000 | | 2012 | 34,750 | | 2011 | 32,500 | | 2010 | 30,000 | | 2009 | 28,600 | | 2008 | 26,000 | | 2007 | 24,000 | | 2006 | 22,000 | | 2005 | 20,000 | | 2004 | 18,392 | | 2003 | 15,900 | | 2002 | 12,167 | | 2001 | 9,797 | | 2000 | 5,558 | | 1999 | 3,648 | | 1998 | 2,445 | | 1997 | 1,620 | | 1996 | 1,002 | | 1995 | 660 |
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