| Year | Value | | 2021 | 141,000 | | 2020 | 141,000 | | 2019 | 141,000 | | 2015 | 141,000 | | 2014 | 139,700 | | 2013 | 138,800 | | 2012 | 135,000 | | 2010 | 131,800 | | 2009 | 128,000 | | 2008 | 120,806 | | 2007 | 113,586 | | 2006 | 109,030 | | 2005 | 103,417 | | 2004 | 98,389 | | 2003 | 69,952 | | 2002 | 61,800 | | 2001 | 53,000 | | 2000 | 15,000 | | 1999 | 12,000 | | 1998 | 5,380 | | 1997 | 3,402 | | 1996 | 3,000 | | 1995 | 1,718 | | 1992 | 20 |
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