| Year | Value | | 2022 | 38,572 | | 2021 | 36,976 | | 2020 | 35,414 | | 2019 | 34,056 | | 2018 | 32,528 | | 2017 | 30,712 | | 2016 | 29,212 | | 2015 | 27,782 | | 2014 | 26,230 | | 2013 | 24,991 | | 2012 | 24,270 | | 2011 | 23,544 | | 2010 | 22,890 | | 2009 | 22,259 | | 2008 | 21,638 | | 2007 | 21,042 | | 2006 | 20,446 | | 2005 | 19,734 | | 2004 | 18,941 | | 2003 | 18,074 | | 2002 | 17,131 | | 2001 | 16,216 | | 2000 | 15,431 | | 1999 | 14,738 | | 1998 | 14,089 | | 1997 | 13,508 | | 1996 | 12,780 | | 1995 | 12,175 | | 1994 | 11,644 | | 1993 | 11,193 | | 1992 | 10,856 | | 1991 | 10,549 | | 1990 | 10,166 |
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