| Year | Value | | 2022 | 23,219,000 | | 2021 | 22,929,000 | | 2020 | 22,588,000 | | 2019 | 22,671,000 | | 2018 | 22,634,000 | | 2017 | 22,400,000 | | 2016 | 22,900,000 | | 2015 | 23,120,000 | | 2014 | 22,920,000 | | 2013 | 22,910,000 | | 2012 | 22,840,000 | | 2011 | 23,420,000 | | 2010 | 24,360,000 | | 2009 | 25,100,000 | | 2008 | 24,470,000 | | 2007 | 20,400,000 | | 2006 | 15,991,000 | | 2005 | 13,354,138 | | 2004 | 10,215,388 | | 2003 | 7,039,898 | | 2002 | 5,110,591 | | 2001 | 3,845,116 | | 2000 | 2,499,000 | | 1999 | 1,355,500 | | 1998 | 643,000 | | 1997 | 201,000 | | 1996 | 17,000 | | 1995 | 9,068 | | 1994 | 2,775 | | 1993 | 800 |
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