| Year | Value | | 2021 | 16,990,714 | | 2020 | 16,660,253 | | 2019 | 17,733,979 | | 2018 | 17,129,676 | | 2017 | 15,386,000 | | 2016 | 13,349,860 | | 2015 | 14,312,271 | | 2014 | 14,039,749 | | 2013 | 12,291,150 | | 2012 | 12,980,000 | | 2011 | 12,917,000 | | 2010 | 11,696,000 | | 2009 | 10,021,861 | | 2008 | 7,056,158 | | 2007 | 6,234,682 | | 2006 | 4,675,000 | | 2005 | 2,950,000 | | 2004 | 2,346,000 | | 2003 | 1,185,000 | | 2002 | 400,000 | | 2001 | 200,000 | | 2000 | 30,000 | | 1999 | 4,000 |
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