| Year | Value | | 2022 | 41,000 | | 2021 | 40,000 | | 2020 | 39,000 | | 2019 | 38,750 | | 2018 | 38,500 | | 2017 | 38,000 | | 2016 | 36,570 | | 2015 | 36,624 | | 2014 | 37,600 | | 2013 | 36,780 | | 2012 | 36,000 | | 2011 | 35,465 | | 2010 | 30,587 | | 2009 | 29,949 | | 2008 | 24,402 | | 2007 | 17,500 | | 2006 | 17,390 | | 2005 | 17,150 | | 2004 | 17,085 | | 2003 | 16,900 | | 2002 | 16,759 | | 2001 | 15,854 | | 2000 | 14,503 | | 1999 | 9,580 | | 1998 | 4,980 | | 1997 | 2,350 | | 1996 | 2,279 | | 1995 | 2,340 | | 1994 | 1,900 | | 1993 | 1,300 | | 1992 | 900 |
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