| Year | Value | | 2022 | 27,383 | | 2021 | 26,019 | | 2020 | 24,746 | | 2019 | 23,291 | | 2018 | 22,102 | | 2017 | 21,410 | | 2016 | 20,831 | | 2015 | 20,260 | | 2014 | 19,712 | | 2013 | 19,163 | | 2012 | 18,629 | | 2011 | 18,050 | | 2010 | 17,377 | | 2009 | 16,645 | | 2008 | 15,854 | | 2007 | 14,989 | | 2006 | 14,153 | | 2005 | 13,374 | | 2004 | 12,641 | | 2003 | 11,945 | | 2002 | 11,292 | | 2001 | 10,729 | | 2000 | 10,297 | | 1999 | 9,938 | | 1998 | 9,634 | | 1997 | 9,443 | | 1996 | 9,120 | | 1995 | 8,745 | | 1994 | 8,353 | | 1993 | 7,935 | | 1992 | 7,467 | | 1991 | 6,990 | | 1990 | 6,562 |
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