| Year | Value | | 2021 | 59,213 | | 2020 | 59,213 | | 2019 | 54,959 | | 2018 | 56,792 | | 2017 | 56,619 | | 2016 | 54,487 | | 2015 | 53,213 | | 2014 | 58,282 | | 2013 | 57,751 | | 2012 | 58,722 | | 2011 | 58,475 | | 2010 | 59,446 | | 2009 | 56,993 | | 2008 | 54,860 | | 2007 | 52,169 | | 2006 | 49,965 | | 2005 | 42,032 | | 2004 | 41,298 | | 2003 | 38,026 | | 2002 | 34,737 | | 2001 | 24,487 | | 2000 | 16,971 | | 1999 | 10,761 | | 1998 | 6,516 | | 1997 | 4,701 | | 1996 | 3,265 | | 1995 | 2,558 | | 1994 | 1,960 | | 1993 | 1,605 | | 1992 | 1,718 | | 1991 | 1,429 |
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